Gonna just go down the list here.
It means exactly fuck all until we can see how you're squatting. It is also unlikely you're overtraining unless there's been some regression in performance. Patellar pain isn't indicative of overtraining so much as it is a minor strain or bad mechanics. Post a form check in the coaches Q&A. This is also not the first time you've been told this (Fencing S&C and SS)
There is no reason to do this unless you're insufficiently recovering between workouts (read: stalling on squats). Cut/dose volume only when it's necessary
Bueno.
This is another for the form checks. Additionally (other than eating more) a small tweak can be just holding your last rep of deadlifts upright until your grip starts to go (double overhand of course).
Negatives or bands are the way to go here since you still need to stabilize yourself during the movement.
You're 6'1", 85kg isn't a good target, shooting for 100kg over the course of the next few months will serve you a lot better.
If you find ab work fun, then go ahead. I would also like to ask how you intend to squat/deadlift/press/bench/clean without using your abs as I've never heard of this happening.
Where it says "Phase 1" Starting Strength Training Programs