I noticed this as well, while searching for hotels in NYC! Several hotels there are opening in 2020. (By the way, the ASCII code for a blank is 20. Maybe someone was trying to insert blanks in the year and it ended up as 2020 instead?)

Anyhow, pretty amusing. But also mildly annoying, since these bogus listings (or should I call them "previews?") take up space on the search page, space that could be occupied by real, existing, available hotels.