Update: so thanks for the responses. My main concern was the safety of the switch and if there was a small fire hazard. I ended up taking a snow day today and picked up a new three way switch and replaced the whole thing. I’m in the process of painting the shelving that I had to dismantle but it wasn’t as bad as I thought.

Yes, they are dimmable.

I used the original non-dimmer switch when I first installed it and it all worked. I also checked the dimmer to make sure that it was rated for LED and it was.