You're right. I missed a great deal of context there, as I was thinking about the most familiar cases to me, where either (a) you're an endurance athlete whose interest is largely maintaining a huge cardio base (see the Mark Twight piece in the sibling comment) or (b) you're getting a ton of 'intermittent' work from your sport, like you say.

Mentally I somehow but that kind of skill work in a different category from "interval" training but that's probably because I've never done an sport like sprinting or short-distance rowing/swimming/etc. Skill training for tennis or boxing or judo or BJJ or whatever doesn't feel like interval training even if it is intermittent and anaerobic... even when the round timer goes off at regular intervals in a 3:1 or 4:1 ratio.