I'll just add two things:
1- He says he has worked for 8 months for our company and he says his name is David (his nickname is DAVIDANDERSON23 and he signs these posts as "David"). So why is there no David in our team? He works 8 months for an ICO and he does not appear on any support?

You can search everywhere on our whitepaper or on any ICO trackers or website where we were referred and you will see that there has never been any David in our team. If you find a proof (photo, links, screenshot etc.) that say the opposite you can share it here.

2- He says himself (without anyone asking him) that he has all the evidence of what he says and when a person asks him to provide evidence he says he will give nothing.

It's typical of scammers, they lie and invent so many stories that they themselves forget their lies.
And when they feel that no one believes them they get bored.

Now, we need to report his account and these posts to be banned from the BitcoinTalk community