You don't seem to understand how elections work. A Democratic district that has been Democratic for decades but went Republican in 2016 -- going back Democratic in a special election is hardly a trend.... in fact it is expected.
Again, who said a SINGLE data point is a trend? Also, you again IGNORED the MARGIN of victory which I tried carefully to explain.
The 2016 election of Trump should not be used as a reference point for special elections --- when trying to compare that Trump won by + 37 in a district but now the Republican only won by +3 (let's suppose) in a special election in a district that has been held by a Democrat for decades. The reality is that the Republican won by +3 in a district that has been Democrat +6 in the past 5 elections for the seat (but they don't mention this). They just want to provide the illusion that the district tilted 34 points to the left by going +37 in 2016 (for Trump) to only +3 in a special election -- while ignoring a national election is very different than a state election.
Ugh, the Kentucky seat went to the Democrat by 37+ points, you are conveniently ignoring that fact. Margins matter.
Plus you are ignoring ALL the other previous results posted in this thread, 37+ seats have been flipped and is a sign of things to come.