If my Jumpluff with the "Fluffy Barrage" Ability attacks and KO's my opponent's Active Galarian Weezing with "Neutralizing Gas" Ability, can I attack a second time?
Yes, you can because Fluffy Barrage is no longer disabled.
Source: TPCi Rules Team (2022-03-03)

Relevant cards

Note: All applicable cards may not be listed below.
SWSH7_4
SWSH7_4
SWSH2_113
SWSH2_113