I was permanently banned from the Reddit sub without recourse for posting this despite not breaking any rules. I'm slowly making the migration over thanks to such encouragement.
This is a good question. The answer is probably "a few years old" at the least. I went hunting for the UPC code on the back label and found this website, which indicates its last recorded scan was some time in 2021. It's likely this product is simply no longer manufactured and sold by them. Probably by virtue of a lack of demand or other considerations.