I think that is a bit simplistic. Tax thresholds have frozen due to debt getting out of control. This is due to the borrowing to fund COVID relief packages, furlough etc. costed billions, as did the vaccine role out and additional spending on the NHS. You can quibble with the usual tropes about PPE contacts for mates etc. but we borrowed in unprecedented quantities to get through that. Additional money sloshing around in the system has predictably fueled inflation, and this was turbo-charged by the invasion of Ukraine. I'm not sure what a Labour government could have done differently, other than maybe some rhetoric about broadest shoulders carrying the heaviest load, sounding great to their cheerleaders, but without too much deviation in actual policy.
So, we have frozen tax thresholds to attempt to control debt, hyperinflation and interest rates rising which is the only real tool to control inflation. I think the government have done a reasonable job given the set of circumstances dished out to them.
There aren't many circumstances where you are just given a £100k salary. It requires expertise, years of hard work and experience. Often, they deserve that. A hospital consultant or such like deserves to be able to buy that range rover and eat at nice restaurants. Their salary reflects (well it should) their hard work, expertise, and their worth to society, and they are duly rewarded.
So I think it is right that the chancellor points out that £100k isn't the ticket to paradise that people think it is, and that people at that earnings point aren't just fair game to clobber for tax.