It’s funny that those books are “non-canon” now but they put Admiral Thrawn in “Rebels”, so he IS canon, even if his entire backstory has been deleted. They also put a Noghri character on that show too. No ysalamiri though :(
Maybe no ysalamiri. They were actually pretty smart about it. Carrying around hundreds of books of canon can be a major albatross. If they’d kept it all then Chewbacca is dead cause a moon fell on him. So they shunted everything over to the Legends. And then they’re going through and picking cool bits out and getting them back to canon. That’s been part of the fun of watching the TV shows, that’s been their primary tool for re-canoning.