Yeah it makes sense to me. I don't have any non sexual partners & I don't know if it would be right for me...I picture it as either being lustless romantic love (nice) or a real frustrating situation where one of us wants sex and the other doesn't or maybe there's romance and low level lust but it doesn't go beyond that. I don't consider two adults who have romantic feelings AND want to have sex but cant, to be non sexual partners
There are close friends I used to have both sexual and romantic feelings for, now I don't, it is a clear difference for me, I did not hang on to romantic love, so they are close friends, period. I can see it possible that if things had gone differently I would've kept feeling romantic love but not be sexual with them, and then I would classify them as non sexual partners.
Happiness will never come to those who fail to appreciate what they already have.