I imagine using a really slow tempo for the warm up sets would be great for warming up, and activating the target muscle. I don’t see much value aside from that
This discussion always tends to "topic jump". I don't want to put words in the OP's mouth here but at least from my view there is a canyon sized difference in super slow techniques and extremely controlled movements to eliminate all momentum. As much as I don't care for his physique, it's pretty crazy to see how Walker trains and he trained like this to put his mass on as well!
Most of his movements are 4-8 second negatives, at least a small pause (sometimes a full 1-2 seconds), and then 2-4 second positive. Absolutely ZERO momentum.
The thing both super slow and this way of training have in common is using far less weight. Super slow would use even less, of course, but you see the leg press Walker is using here? I've seen people load up the entire thing and Walker is usually using 6-8 plates per side but he continues to get stronger within this way of training. There is no doubt, if he lifted like most bbers he could probably double the amount of 45's on that thing. But that isn't going to actually increase muscular tension. Now super slow on the other hand (referring to the 10-30+ second positives and negatives) you do turn it into more of a endurance type of workout where "the burn" will cause you to stop far before you create enough muscular tension.