IMO any stress can lead to burnout stress, at some point it just kinda clicks and nothing seems to lead to anything better anymore, you start feeling like it's only going down. At least that's how it started for me. Imposter syndrome was getting stronger the less work I was felt able to do.

The main reason I know it was a burnout is that I never really found back. I am done with tech, or rather done with 40 hour weeks, done with unrealistic deadlines, done with so many things actually.