AsJx wants to bet the turn, because it wants to block AsQs, while AsQx does not want to block AsJs AsTs that check call the turn and are going to call a jam on a river Ace: this is an effect of tight ranges. In wider ranges scenarios you sometimes see AK without the spade betting the turn for value against the Ace high flush draws and the AsJx AsTx betting to leverage the fold equity generated by the FD blocker (getting to fold AQ on a second barrel).

In general, betting AsQx is not a punt, but if you're not careful and do not understand the implication of your choice you end up with too many potential bluffs on the river. This is not necessarily bad, as if you expect the opponent to overfold the river overbluffing the turn with a hand like that and overbluffing river spades is a good exploitative play (the opponent can counter-exploit you by calling all the 0 EV hands at full frequency). You have to be aware that you're doing it to exploit the opponent without assuming it's the theoretical baseline, though.