How you define things is very far from nonsense. He says "a block isn't a block, it could be a block and a grab, or a block and a strike." Then...it still is just a block, but it is combo'd with another technique.
Let's look at it another way. I can do a jab by itself. I can do a jab + cross combo. I can do a jab-jab cross combo. I can do jab-cross-hook-uppercut combo. I can do a jab-hook combo with the same hand. I can do lots of things after a jab. So is a jab all of those things? No. It is a jab, which can be used in combination with any number of things. But it is still just a jab.
A wheel is just a wheel, even if it's part of a car. A letter is a letter, even if it's part of a word. A pair of boots is just a pair of boots, and not a whole outfit. And a block is a block. A block, grab, and counter-attack is a block in combination (even if simultaneous combination) with other techniques. It does not stop being a block because you're doing something else, too. It does not stop being a block because there's other techniques being used.
In this context, it appears to me he's talking about the difference between a high block by itself (just a block), or a block combined with a strike (i.e. high block with left arm and punch with right arm), or a block chained into a grapple (i.e. block the punch, then grab the arm or shoulder and transition into a joint lock or throw).
So in this context, is the "block" a block, or is it all of those things? I would argue that by itself it's still just a block. It's just a block in combination.
What you're talking about is a completely different conversation.