Hopefully the item restriction is temporary and they're working on a way to verify whether the recipient already has the one time use items. They have to know how much potential revenue they're going to be losing with the holidays approaching fast. The losses they ended up taking from that scam going around earlier this year must have been significant for them to be willing to lose the future sales.

I find it strange that they added costume sets to the list of gifted items. While costume sets aren't technically single use, there's also no point in having more than one of the same costume.

While it's nice they added this to the broader statement about RMT activity

We strongly encourage players to refrain from engaging with these groups, as there would be no reason for RMT vendors to exist if players do not use their services.
it's a shame they don't seem interested in taking meaningful action against those players that are engaging in the RMT transactions. As long as there's no penalty to the player for purchasing from RMT, there will be players that make certain RMT stays in business.