This was release in 2019 and should continue to recieve the updates (based on Apple’s history of supporting devices)for quite some time.
(Look at the release dates vs the End of Life Dates)
The 90 day warranty does not give me the warm fuzzies about buying this refurbished from woot, however, that’s a part of the reason that the watch is cheaper than buying from Apple; after 90 days you’re on your own for any issues you might have (honestly - with the stories I’ve read in multiple different comment sections when these watches come up for sale I’d just buy direct from Apple - it might be more money but you’ll get a 1 year warranty on the device). Apple Watch Series 6 (Your Choice) - #4 by neuronbob
Apple Watch Series 6 (Your Choice) (S&D) - #3 by swanny57