I too am upset about Labour and their scum budget but this video is very misleading.
The tax he is referring to is not new from this budget. It is a tax specific to under 18’s investment earnings. It is in place to disincentivise high income earners and investor from dodging tax by trading or pushing their income through their kids or other beneficiaries via trusts.
It’s very unfair to genuine teen investors, although teens can work, they legally aren’t allowed to trade the markets under their name and must have oversight.