This chip will likely be used in a revision of the current Switch model and/or the Switch Mini, but I have a feeling that Switch Pro, if it indeed exists, won't be using it. Simply overclocking the Tegra X1 is not going to give a meaningful enough performance increase to amount to anything.
There has never been anything credible that suggested that a Switch Pro is in the works.
The most credible rumor talked about two upcoming Switch revisions.
I am curious why you seem to be ignoring a major element of the thread's cited article, namely the evidence suggesting two distinct APU ID's were merged into one. Perhaps once representing slightly different production cost / performance spec products, but ultimately merged into one developer target. Without the information linking them and their merging, it's reasonable that other bits of info were once interpreted as two distinct SKUs, but I don't understand why taking into account the evidence mentioned, one would still assume 2 SKUs. If you have a special angle on this that I'm missing, it seems like you would want to elaborate on that, to explain why the article is mistaken or likely mistaken etc?
The reason why I am still going with two SKUs is that it will be more efficient in manufacturing costs to use the new chip in all Switch consoles, rather than paying for smaller quantities of the new and the old chip. A Switch Mini is not going to replace the current Switch SKU, just like XL versions of the DS and 3DS didn't replace their respective standard sized models, so the future is that there will be two Switch SKUs on the market in any case. The only difference with Switch is that it first launched in XL size, so the order of launching different sizes is reversed. From a manufacturing point of view, it makes more sense to replace the current Switch with a very similar SKU that also uses the new chip. Such a replacement also presents an opportunity to make small improvements; one that is commonly mentioned is smaller bezels to make the screen a bit bigger without changing the overall size of the console.
More importantly, I don't think the article is mistaken. Its only shortcoming is that it doesn't explore the possibility of two new SKUs and doesn't take into account the rumor that was posted by the Wall Street Journal. This article is a very tech-focused piece, so my response wasn't "this is wrong", but how will Nintendo use this advancement in technology and sell it.