While it’s very widespread for authors to write about ratios of nutrients and people to look for ratios, in a large majority of instances what is important is amounts rather than exact ratios, or often even ratios at all.
When having a relatively high protein diet in the first place, such as 1 gram per lb bodyweight or close to it, and certainly when more than this, there seems no indication that the amount of valine already provided in the diet isn’t already providing 100% of the possible benefit. Or put another way, I haven’t seen any indication that supplementing with valine is in itself worth doing.
But if it happens to come along with a product or material you’d otherwise want to use, at a relatively low percentage of BCAA content, that’s not a problem.
As to whether there’s a benefit to supplementing with added free isoleucine as a free amino acid when it’s already being richly provided in di and tripeptide form, or in the context of a high protein diet, I don’t know, it seems to be a subtlety not yet determined. I wouldn’t be concerned at all about there being a disadvantage of it being in there with a BCAA product at amounts such as well under half the amount of leucine. But no need for an exact ratio.
So for example, BlueCollarTr8n’s supplementation adds up to 7.5 g leucine, 1.5 g isoleucine, 1.5 g valine. No problem with these amounts whatsoever, sounds good.