It's not a glitch and you don't have 50 years of map data. Remember a few weeks ago when people were having expired maps and it wasn't updating? This is part of the quick and dirty fix put in place to get BlueCruise active again at a minimum. Your next map update to go back to being only 6 months
I was just about to post a thread on this! Good thing I searched on "2073" first. Agree with @Gimme_my_MME, that is a logical conclusion. Interestingly, before it updated to 2073 my BC had extended normally to a mid-2023 expiration. I suppose I got on the list for this temporary fix as I was one of the cars with expired BC at the start of 2023.
I even had a Ford rep reach out to me via email last week to ask if my BC was working, which was a unexpected but very welcome improvement in customer service.