Earlier quoted context omitted.
Sweden had an election yesterday, and I can't think of a single political subject where political opponents do not accuse the other side of being insincere. Environment, taxes, law and order, immigration, education, healthcare, elder care... "You say you want X, yet you still say/do/vote Y" would match the intended message in about 95% of every statement being made when a politician is describing an other politician…
At the very least giving a name to the phenomena (and logical fallacy experts, please chime in) gives people the power to identify and categorize such arguments as not being worthwhile pursuits and can castrate their power.
Of course, when people are pulling and advocating for one direction, doing the opposite seems like an contradiction. Thus the political debates becomes about trust and sincerity. No longer is the discussion about the effectiveness of the strategy but rather about how trustworthy the strategy is.
One very common way polls measure political strategies is thus in voter trust. Do voters trust that party X has a good strategy to solve problem Y. It generally only experts and researchers that attempt to measure the actually effectiveness of a political strategy.