Can confirm, all of the kit that I had on Treek is gone. The weapons, armor - everything. On every character, so thats 12 toons that I use treek to level with. It was mostly the Yavin companion stuff, but there were a few rare items in there.
What is interesting is on one of my characters I saw that I had a 12 beside the email icon at the top of the screen, but when I went to open email only 6 were in the inbox. Those emails were the 'welcome to kotfe, here's Nico for you' etc. Once I collected the items from the 6 emails , the 12 beside the email icon disappeared. It's like the system "almost" delivered them.
They nerfed the pants off Treek with this patch (pun intended) - I hope this gets resolved or that's a second kick in the jewels.