Nah they're for real. Just takes a while to arrive in my experience. Try kitbag as well.
Selltshirt has Chinese knockoffs. Granted, they're very close to the real thing in my opinion and most of the people who've ordered from them, but they're not real.
Spend the extra money at Kitbag and you get the real thing quicker.
And for the "don't dry them" comment...hand wash inside out and airdry. Best way to wash any jerseys.