i watched dan murrell's review of the episode and he said it was like the architect scene in the matrix reloaded. that's EXACTLY how i felt.
it's not completely the same because he who remains (ok, i won't be presumptuous and call him kang - according to wikipedia he's more like immortus than kang anyway? whatever) is a way more entertaining character than the architect. but it is a similar "a new character appears completely out of the blue and explains things to the protagonist (really the audience) for a ton of time" kind of thing. lazy writing.
This is a ridiculous comparison. The reveal isn't even close to 'out of the blue'. From the get go, Loki's trying to figure out exactly what the TVA is. We know someone is behind the curtain from episode one. We just think it's the Time Keepers, then when they're revealed to be fake it turns into who's actually behind the creation of the TVA. Which frankly is far better writing than it just being the Time Keepers.
Also you're really referencing a Dan Murrell review? I haven't watched his reviews, but I've watched a lot of Movie Fights and he's by far the biggest buzz kill on Screen Junkies and it makes you wonder if he even enjoys watching movies.