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Firstly. I said 'feels' because I share Your sceptism. For the most part I feel I'd benefit from 'upping' climbing cadence.
Secondly. This isnt a session I do very frequently. I just heard some of the guy in my Club do a similar thing pre-season.
But I did do a quite few drills in the run up to my Mallorca trip. My thinking was that I spend too much time out of the saddle on a Climb, and maybe this would help me sit down for longer. I kinda feel that it had this affect. But I have a terrible time working out on the turbo. I suspect that whatever the reason is that my Power is far lower, while sat static, on the turbo. Is also holding me back when climbing seated.
I think one of the ideas behind high resistance turbo work. Is maintaining form under pressure (for this I also do high cadence intervals). So it could just be an inprovement in form.
Thats specifically my own needs though. If I felt I lacked leg strength, I think I'd do these more often.
Low cadence work (<70) at around FTP for a few minutes on the turbo is pretty brutal. Defintely feels like it helps.