Only true assuming your personal economic choices.
Other choices cut have been more spending cuts (not that I would expect that from a Labour government of course), or relaxing fiscal rules to allow further borrowing, to fuel growth.
Personally I would prefer the latter. It is plainly obvious to anyone who spends more than a millisecond thinking about it, that you do not fuel growth by taking more money off people and reducing their spending power. You should do the opposite, and if that requires more borrowing in the short term, to get the economy going, then that would be sensible. Cut direct taxes, people spend more, what they buy is taxed, businesses grow and that is taxed and soon, tax receipts are increased.
Truss was on the right lines but made 2 bad mistakes. First, she neglected to sell her plan to the BoE or the markets, who as you say, got spooked. Second, she got the optics badly wrong as there was no need to cut the top rate of tax and that did look bad.
PS your comment about Starmer having to pre-announce else the markets would get spooked is obviously nonsense. Because as you said in the same post, everyone knows tax rises are coming. Not the same as the Truss situation at all where she sprung the changes on a completely unsuspecting market.
I also find it particulary nauseating that Starmer spent the last 5 years moaning about our terribly high rates of tax, only to get in and announce that he's putting them up. And all this "won't increase taxes on working people" is also diabolical lie, as you will see in a few weeks when "working people" will be paying more for their petrol, booze and cigarettes. And also I expect, getting less tax relief on their pension contributions. Plus other utter bollocks about which I can only speculate.