There are lots of criticisms that could and should be levied against the Tories re. their no-deal planning and economic management, but this is the wrong line of attack; spending money to prop up the nation's economy is not equivalent to spending money to tackle a social agenda.
That said, the sad thing is that politics in this country has become so tribal and intellectual discussions so hysterical, that it doesn't even matter; if this was a solid argument, those on the right would disregard it, and even if it wasn't, those on the left would bleat it. We live in a world where people only care about what reinforces what they already think, no matter how tenuous, and everything else is fake news.