I have an azub 6 and a lightning p-38.
I consider them to be more as types of craft than mere bikes!
Yes, mercifully getting away from the endless disagreements and splitting of a hairs about UCI definitions, etc.
For some, maybe some form of regulated racing is their life, or some sort of trickle down effect into their sporty activities. Well, fair enough.
Having no interest in that sort of stuff in the many decades that I rode conventional bikes before I tried my first recumbent I couldn't give more than one or less than three hoots about the UCI or whatever gang you have to be accepted by to pursue your two wheeled activities.
I have to agree with
@RANDOR that the right recumbent for you may just be a bike, but if it has the right combination of virtues, it's somehow more than just a bike. Even my old less than speedy Linear somehow combined the sensation of low flying with stately ship like progress and an ability to keep trundling along comfortably all day, up hill and down dale. It took me some years and several different recumbents to incrementally improve on it and find a worthy successor for my needs, and a couple of them along the way didn't work for me at all.
So a recumbent may be a bike in that it has two wheels, but just as all bikes may not be created equal, neither are recumbents. And most recumbents nowadays are more likely to be trikes!