Its actually a scam run by user Darryn using fake feedbacks from stolen \ bruteforced accounts.
Look at this thread: /forum/escape-tarkov-trading/4657505-sipecheats-escape-tarkov-private-cheat-aimbot-esp-undetected.html
As i can see - first post by user Darryn (who just started selling his Rust cheat) is an alt of topicstarter (sipedche).
All feedbacks in Darryn & sipedche threads are left by accounts which were inactive for years and suddenly came back:
golom678 (left feedbacks on both Darryn & sipedche threads): inactive from 2016, became active yesterday.
RichardKara (left feedbacks on both Darryn & sipedche threads): inactive from 2017, became active yesterday.
alex10lemke (left feedbacks on both Darryn & sipedche threads): inactive from 2017, became active yesterday.
dondared (left feedbacks on both Darryn & sipedche threads): inactive from 2015, became active yesterday.
Beware & keep your money safe.
Cheers