There's bullshit and then there's this:
Hard to know where to even start with that.
For one thing, I have never seen anything that would indicate he's even trying to "calculate available space in real time and serve up a dynamic ad in real time."
I've been browsing that site for years, on all sorts of devices, and I've only seen one size/shape ad there. It will never be "best suited for the end user's browser and screen" because it never frickin' changes.
As for "running on a few test boards and only on thread listing pages," that's just not true. I have seen this problem on many, many pages. I strongly suspect that it's a potential issue on every page at CSNBBS.
Then he says he needs iOS screen shots. That's especially disingenuous. Reproducing this problem is trivial, and is possible on every browser/platform I've tested.
There's a lot of funny shit on that part of the board, really. There's one thread where someone suggests he use NodeBB instead of MyBB, and Jeremy responds with some crap about writing his own forum software instead, in "Google Go." That was in 2014, and he's still using MyBB.
Make an account here, Jeremy, and I'll tell you *exactly* where you can "Google Go," and it's not "to the polls."