There are many variants. I was hired into a group based on tons of positive reviews of my work from a variety of senior engineering roles.
When I got into the group, I was asked to do stuff I had never done. Okay, I start to learn it, but slowly.
Then I was reorged into a different group, doing stuff I had never done. Okay, I start to learn it, but slowly.
Then I was reorged into a different group, now I'm a Developer, when I've never programmed professionally before.
I am far far worse than my colleagues at even simple tasks. It's not that I'm not trying, I'm working tons to try and learn data structures, and programming to be able to complete my job.
But it would be entirely valid for my coworkers to feel the same way about me, as you describe about this guy.
It's likely going to take another 4-6 months before I'm competent at my job. Will my colleagues still care at that point? Will I be reorged into another position by then? Who knows?
And I'm an expert at many fields, just none of the ones I'm being asked to do.
I'd leave, except my colleagues are great, the topics are great, and if someone is going to pay me to learn how to be a proper developer, I'd be stupid not to do this.
But it's hard as fuck, and I'm certainly not pulling my weight.