CDR doesnt affect teemo much at all, since he can "save stacks" of mushrooms, nobody ever asked "hey teemo do you have your ult?"
That's wrong though. CDR is a valuable stat for Teemo because he can have more mushrooms on the map. With 40% CDR on rank 3 R you can plant mushroom every 12 seconds, which translated to up to 27 mushrooms on map at once. With 0% CDR you can plant shrooms every 20 seconds, which translates to 17 mushrooms on map at once.
Teemo mushrooms apply 5 seconds of DFT
False. They apply 4 seconds of DFT, just as you'd expect.
DFT on Q Dart - 16 damage all levels
Again, incorrect information. It's 8 damage at all levels (applies 8 ticks of damage, each deals only 1 base damage).
As far as Teemo vs Nasus matchup goes - it's actually in favor of Nasus from almost beginning (first 2 levels Teemo might have advantage). Wither is way more crippling for Teemo than blind is for Nasus and by maxing E, Nasus can outpoke Teemo (which, unlike Nasus - has no innate sustain).
All three pages will use AS marks because they are necessary to control the minion wave
I disagree with that. Against Pantheon (and other champions that you can trade safely only with Q) you really want to take M. Pen. marks - since chances are you won't get an occassion to actually use that Attack Speed at all (usually you can allow yourself only a single attack to last hit and Q the Pantheon - making AS runes completely useless in this matchup).
That said, in matchups where you can allow yourself to auto, AS marks are quite possibly the best.
Also, a curiosity in your Anti-Panth rune page - you clearly realize the worth of Armor Quints (as you put 2 of them in vs AD rune page), yet you don't use them in the matchup where they would be most effective. I recommend Mpen Marks, 5-6 Scaling Health Seals, 3-4 Flat Health Seals (for that early survivability), 9 Flat AP Glyps and 3 Armor Quints against Pantheon. Try it out.
I'm surprised that your Hybrid Anti-tank Build doesn't include both Liandry and Frozen at the same time. Due to this combination you can get improved Liandry proc from Q by just autoattacking the enemy.
Also, considering that this is an educational video, I would like to see actual stats of enemies, your stats, items, dragons, etc. in those clips. It's as if I just post this:
https://webmshare.com/play/MJdP0
And say that Shroomo is clearly the best build (though, dealing over 1350 damage in one shroom is impressive, no matter what).
Now, putting that all aside - this is a very informative video, and I'm sure it will help a ton of new Teemo players and we could always use more Teemo mains in League (with that I just sentenced my post to be downvoted into oblivion).
EDIT: Oh wow, I was sure I was writing a completely new post, not a reply. Ah well, it will do.