On average that video probably ends up closer to Middle English than not. There are just a few uninformed or humorous choices that throw it off
If you ask nicely perhaps I’ll read you some Chaucer or something in Middle English, but tl;dr English spelling is from the time it sounded like this:
PS Any of us continental Europeans should be able to read Middle English quite well, provided we can pronounce the two th sounds (/θ/ and /ð/). It’s only around Shakespeare’s time that the Great Vowel Shift changed the pronunciation of the vowels.
But @Sushi and I have a leg up on you guys by natively speaking Dutch, since the correct way to pronounce Middle English is essentially to pretend you’re a Dutch speaker who doesn’t know Modern English pronunciation.