The seller seems trustworthy. Gives you general warning against buying black market platinum and tells you about the risks. Also tries to minimize it by only buying it for prime parts. I will update the post in the following weeks based on whether it will get removed or not.
EDIT: 2 weeks. No signs of platinum being removed.
This is my 3rd purchase from phoenix and still no ban, its been a few weeks and STILL no ban or negative plat, 100% legit trader, HIGHLY recommend this guy, he's awesome
bought 3000 platinum so far, i will be buying more in future because this seller is 100% legit, do not go to playerauction and buy from plat4buy/etc, those people use fake credit cards/etc, i have bought twice from 2 separate people there and both my accounts were suspended