Sorry but something does not add up here.
Are you implying that the person who will contact you via telegram is part of the scam? If so, I don't see the point why he/she needs to send you btc to be withdrawn because no one would be stupid enough to deposit their own fund just to help someone else.
And Yes. You will receive some btc after signing up and giving him your email
How much did you get after signing up?
Im also confused, I think the person who contacted you is a different person in the one who own the platform. Hmmm who are you accusing as a scammer? the person on telegram that contacted you or the website?
If the website I think no one here is fool enough to fall for this aside from newbies.