Any analysis of the British economy over the past 40 years shows how the decline of union power since the early 1980s has coincided with the fall in the proportion of GDP that goes to pay, and the rise of profits.
The profit share is about where it was in 1950. Self employed income has risen. Taxation of consumption has risen. And it’s those last two that have led to the fall in the labour share.
Within the labour share the increase in employers’ social contribuitions near exactly matches the fall in the wage share (the two, plus any other benefits paid to workers, make up the labour share).
It simply isn’t true that the wages have fallen because the profits have risen.