Yep, very plausible. Also, some parts of the brain would still be active, I wasn't brain-dead after all.

The OBE itself had some dream-like qualities, though one thing I did notice was that the "resolution" was superb, unlike my normal dreams. We're talking next-gen graphics. The closest thing I can compare it to is as if the entire field of vision was center of focus.

Sometimes I dream like that. It's the oddest bthing to dream something with the fidelity of, or even above, ones default conscious experience.

Clear enough to afterwards, even years later, be able to recall the exact color and texture of the floor tile glazing, just how a doorway arched, and precisely how a distinctly non human entity looked and acted.

Curiously, at least to me, it's primarily a profoundly visual experience. Sound, touch, and smell is rarely, if ever, prominent in those dreams. Maybe the clarity of vision somehow drowns them out, or maybe I simply don't dream much in sound, but it only becomes apparent when the visual experience is almost jarringly clear.

If you study lucid dreaming, more of your dreams will become like that. Extra real. You'll have to use "reality checks" to know whether it's a dream. That's usually how you wake up inside a dream to begin with, though. You'll be able to control some, too.

Lucid dreaming resources will teach you about all that. You'll probably enjoy it.

Lightswitches and digital clocks are common tests, as are punching, jumping and most kinestetic tasks.

Incidentally, the brain retconning to fill in gaps is actually so mundane and common, you do it hundreds of thousands of times per day. See: https://en.wikipedia.org/wiki/Chronostasis

Reading your comment it occurs to me that all remembering is retconning. But I'm not a neurologist either!