Dont know whether fares have changed, but that does seem to be about the difference between the U fare and the W fare in October

Checking for September , the lowest fare seems to be a B class fare and there seems to be a $2000 difference to W

Looks like there is a cheaper class introduced

Looking at historical fares, for october EF is showing fares for tickets issued last month
B 6250
M 7780
W 9040

whilst now

U 6920
B 8420
M 9620
W 10920

The cheapest fare is now about the same price , but the cheapest flex fare is now $2000 more expensive

( fares shown are exclusive of taxes and fines )