I appreciate seeing some actual feedback, much of which I think is in line with myself.
I read the article yesterday and was too lazy to post, but felt the superset stuff kind of missed the mark or doesn't fully line up with all the literature (and same for the exercise swaps). Your feedback is a little more in line, which is cool considering it is based on what worked for you, but seems to line up with what we see in the studies.
Personally (to add on my feedback):
1) I think these can be cool, I think I go back and forth a bit on "how" big a deal they are as it seems the hot new thing to obsess with. On a side note the curls in the video kind of make me laugh as the lengthened partials almost looks like most people's full rom while the unlengthened looks like newbie curls when you have to teach people proper rom. I think mostly I find it just helps reinforce taking some weight off and getting that full rom instead of missing that extra rom for more weight (even if not adopting actual partials).
2) I think the article misses the point or doesn't highlight the strengths and weaknesses here. Agonist-antagonist sets appear to be a great option (once conditioning is adequate and they are built up to) to shorten time frame (without hindering hypertrophy) or increase amount of work in a given time frame, which with the increasing amount of research showing higher and higher volume amounts still improving hypertrophy rates seems to be an even more beneficial/important thing to keep in mind. I feel biased because I've been programming agonist-antagonist work for decades now.
The idea of same muscle group super sets though I think are a lot less viable. I love to keep everything available as an option and think many things can have a place, but there are a lot of trade offs here. The specific study linked doesn't seem as incredibly positive to me or is a bit murky in its methods (I'll avoid getting sidetracked here), but the increased "intensity" of these types of super sets may be beneficial in periods where you want to really push things. When done though it is probably best during time periods when training is more infrequent (or when hitting each muscle group more infrequently) and/or just really trying to get better activation or building better ability to target a specific muscle.
3) Personally have seen an absolute ton of success in rebab with this. For non-injured athletes though I think there might still be some place. Arm work as a way to increase total volume/frequency and/or when trying to maintain, but doing a focus on other things and wanting to keep fatigue managed works great. As a finisher on legs after heavier training is another option I personally employ from time to time.
I think cheaper BFR are fine, I'd caution though that you might not need to crank them as hard as you think. I've used calibrated sets a ton and honestly usually always think it isn't tightened enough, but then get going and get a really good stimulus, just as a personal anecdote.
4) I don't think the article really even makes a case for this, but whatever. It does make sense to choose what seems to perform best for each, if that is the direction it was trying to go.
5) I don't do a ton of this and still am unsure about how applicable it really is, but I do know people who do enjoy it and your caveats seem like the optimal suggestions for it is chosen to be done.