They don't 'update' the sticker when a receiver is refurb'ed, so that's when it was built new. Based on yours it doesn't appear they have stopped making them, unless it was within the last few months.The sticker on mine says it was manufactured in April 2019, but I supposed that could be when it was refurbed.
You have or have had ?The HR54 is alive and well. In fact, I have several HR44s still. Unless you’re getting 4K you’re more likely to get the HR44 as there is a small shortage on the HR54s at present. Kind of a mixed batch at the moment, I believe I have 6 HR44, 5 HR54 and 3 like the model posted, the cyclops HR54.