I'm really surprised by this myself, aside from the Echo minifigure (which had its age rating bumped up after Lego had already released the figure) they have always stuck very strongly to their rule of no R rated media based sets, which is why I also thought the 2019 one was exclusively based on S1.
It's really odd, but I guess we'll see just quite how "R Rated" the fifth season will be, S4 was already pretty rough and still got away with a TV-14 rating so I'm not really sure what to expect, but it would be quite odd to have a Lego set based off something with constant f bombs and explicit gore in it
(and no, before someone asks, none of the figures in this set look delicious to me )
