I think he's talking about his own evaluation of himself (based on what people told him) and how that caused him to deploy his own resources.

People who tell me I'm strong are complimenting me, but if I end up thinking I can carry a big ol' sofa up the stairs all by myself, I'm going to have a bad time :)

I recently realized in the past I’ve had an inflated self-perception of myself specifically around work ethic and “grit.”

But I conveniently ignored areas where I have failed to put in the work and push through.

It may be okay to not have “grit.” I no longer believe I have any more or less grit than the average person.

I’m not sure what this realization necessarily means nor do I fault anyone else for this. It just is what it is!

I don't know what to say, it depends on what those "ignored areas" are. We have a primary goal and prioritize for it, not getting all the way on your second and third priorities isn't exactly uncommon.

Do you "have" grit or do you display it? It's part of character we choose how much energy to put in.