Linguists don’t know squat about grammar in modern times. Everything is a verb these days. I Google things. I FedEx things. My game gets nerfed.
That's a bit broad. Talk to the right kind of linguists, and yes, they do know these things.Every problem he talks about is well-known. Not to say that they aren't still problems- they are problems, and hard ones, that linguists (computational and otherwise) don't have good standard solutions for. Thing is, most of the time, you can get away with not bothering to solve the real problem. Most of the time, you can pretend that white-space separates words and periods separated sentences and that 8 parts of speech is good enough, and it will be good enough. And thus the incentive to spend lots of time and research money on solving all of the big problems in natural language processing is reduced.
Except when it isn't good enough, and we wonder "why the heck hasn't this been solved yet? Doesn't anybody realize that this library is totally broken?" But yeah, we know that it's broken, we know what the problems are, they're just really frickin' hard.