For example, if you check the GPLv3 it says "Must: Include Source", which is incorrect (you must include the source code ONLY if there's distribution).
If you click on the "Include Source" text, then it shows a note saying "Copies of the software/instructions to obtain copies must be distributed with the software".
The quick summary isn't brilliant either.
As TL;DR doesn't work very well if you can get incorrect information.
1) It shows no differences between GPLv2 and GPLv3. It's not a good sign.
2) I would put shitloads of banners everywhere saying that you're using this site at your own risk.