I have a feeling it's gonna make a comeback here with the revival of these fruity flavorful strains like the oranges that are so good for concentrates.. I think grapefruit would make for dank concentrates from those terms.
And there are a few but one really good one, I assume it's the one u say is from Santa cruz.. I have a few crosses I think I a go through, mota has made a few strains using a grapefruit, i think he has two different ones tho, one being the sweet pink grapefruit and the other I'm not sure, I know wood horse made a large yielding one that's prolly based off the bc cut. I got a grapefruit x herijuana he made I've been dying to try.
Also gonna try some of motas grapefruit x long bottomleaf that I have, I was just telling my partner yesterday I wanted to look for some grapefruit strains to run for concentrates