Well done on spotting this!
For anyone unsure about what this means, the important part is this:
We know from a variety of sources that the T239 chip is Drake, ie the one being used in the new Switch model. It having "eight cores in a single cluster" means it has 8 CPU cores (obviously), but doesn't strictly speaking limit what those cores can be, as ARM's DynamicIQ supports clusters with mixes of different cores (eg 4x A78 and 4x A55). However, as the code would almost certainly have to be changed to support these hetergeneous clusters (ie different core types would run at different frequencies), and the commit here doesn't make such changes, we can reasonably assume that the cores are all of the same type. The only big ARM cores which can be configured with 8 cores in a single cluster are the A78 (in the A78C variant) and later, and given the T234/Orin SoC uses A78 cores, it seems very likely that T239 is using an 8 core A78C CPU.
Furthermore, the fact that T239 support is being added to the Linux kernel means that Nvidia plan to use it in products other than the new Switch. This isn't particularly surprising, as the Mariko chip (T210B01) was also created for Nintendo, but used in other products (Jetson Nano), so Nintendo don't seem to have any problem with their semi-custom parts being used elsewhere. It likely allows them to get a better deal from Nvidia.
Lastly, code being updated to support T239 likely means that there is actually hardware to run this code on. That is, at the very least, engineering samples of T239 already exist, meaning full scale production of the chip is likely to start soon if it hasn't already.
It could be a Shield product, or Jetson (although that would have some overlap with Jetson Orin NX in performance), or it could be a third party product, like an Android tablet or Chromebook or whatever. Hard to tell, but they definitely expect to use this in non-Nintendo products.