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surely improving your FTP is a function of increasing your absolute power output and the % of that you can hold for an hour.
What you are trying to do with these 40/20 things is improve your absolute power, but you cant ignore the other section and hope to improve.
In the same way for a 5k, doing 100m sprints is great at improving your raw speed, just doing those wont be very good at helping you hold that raw speed for longer, you need to do some longer slower runs as well.
Sainsburys_Ed
I can see sweetspot training being super useful. The defining bonus being the relatively low Level of fatigue.
But I cant see it being the right thing for obtaining an FTP increase.
You dont run half marathons to improve Your 5km pace.