If my calculations are correct, that means the SI work period was >1.0 IF for 34.5 minutes, and the LI work period was .98 IF for 27.5 minutes.
(Note that the rest intervals were done at 50% intensity of the work intervals, which is higher than we’d do it. Though I’m sceptical that the 15sec periods were done that high in the SI sessions.)
I’d like to have seen the HR or oxygen uptake during those sessions. My instinct is still that time spent at a high % of vo2max makes sense as the best indicator of likely adaptations. And you can get that from shorter or longer intervals; whichever works for you.