Please explain more about errors and problems you had?

i have over 150 installations with no errors?

Hypothetically speaking, for you to loose all of your site's data means the database has to be cleared. Something the CMS itself doesn't do on its own. Now, if you tried to install another CMS (or c5 install) using the same database perhaps it would clear the data. Every site needs its own database.

I once had a customer tick their host's 1-click install for a shop, thinking it would add a shop to their site. Instead it replaced the entire site with a 1-click install of the host's own shop product.
Fortunately the database and files were still there behind the scenes, so I was able to recover nearly all of it and re-build the rest.

To me this sounds like a security issue. It sounds you might not have had your site secured properly.

Were you running the latest version of concrete5? With some of the older releases of 5.6, there was some security hole discovered at some point that someone could have exploited. Not sure exactly what it was about but I know it was a big issue a while back.

In order to avoid these, always run updates on timely manner for both core and any add-ons running on your site.

Of course, follow also your email since in case there are any major security holes discovered, you will be notified about it by the core team to remind to update your version.

Other thing that might have happened is that someone injected some JavaScript to your site through that link which might have caused harm to your website. There should not be any CSRF holes in the front-end of concrete5 (at least ones that I'm aware of) but in case you have e.g. custom or 3rd party blocks on your site, it might be possible that they might contain such holes, in which case you should report them to the developer as soon as possible before posting it publicly online (be responsible).

this looks like spam to me.

I agree with @tallacman
This looks like a BS post, probably a troll by a Fanboy of some other CMS.

Maybe they're scared... I can see it now... flocks of Drupal Devs switching over to Concrete5. Hehehe </grin>

Deep down we all knew it was coming didn't we?

I'd guess this person is Chinese. The heading Wu is a Chinese name and word. The username made only of numbers is a very common thing in China, often a phone number or something meaningful.

The message looks like it was translated by Google from Chinese. The structure looks identical. I had to deal with a lot of translation done that way with my students over there so this really looks familiar.

I would say it might be a genuine message. It is true that bashing and disappearing doesn't usually spell "genuine" but I'm not 100% convinced it's a troll.

A big waste of time yes, but maybe not a troll.

Anyway, just some guessing and personal assumptions...

Carry on

Since this message is lost anyway, I have a little joke.

A kid kept getting in trouble because every time he was sent to his room he would show his anger by slamming the doors on his way there.

So to avoid even more trouble, now, on his way to his room, he shouts "Jim Morrison was overrated!"

:)

Hmm, I don't get it.... then again most people probably don't get mine :)

"Slamming the doors"
"Jim Morrison was overrated"...

I know, I like riddles...

Anyway, you're just a tough crowd that's all. My comedy skills are incredible! :)

I got it

John... You're a pal. One day I'll come all the way to the UK and we'll share a beer and some more jokes!

SO what, I don't have a good sense of humor? Or maybe the US is too far for a beer...
Well OK, the joke probably was fine as is, and I'm sure you're hilarious, but you have t admit much of the delivery is lost in writing it (I'm assuming with your comedy skills you have awesome delivery).

And @JohntheFish no surprise you got it cuz you is really smart :-)