while I agree that the author of this piece needs to make sure they're submitting DMCA takedowns to the appropriate place, I still think that a company trying to bill themselves as an academic institution shouldn't be allowed ANY infringement.
But what difference does it make - it's the classic user provided content model and all the issues it comes with that's causing the problem here. No company, academic or otherwise, wants infringement and if there was a perfect solution then everyone would use it, however it's just not feasible to be perfectly defensive and catch everything.
They do have > 500 employees so it's a company big enough to have checks in place with other video providers to catch basic things like this but still, it's a much harder problem than people think.