It's a bold face lie, just propaganda. Here's the table from the tax authority for 2022:
https://info.portaldasfinancas.gov.pt/pt/informacao_fiscal/c...
The top marginal rate is 48% at 78834 €, so if you earn 80k€, that 48% is applied to 2k. Regular marginal tax rate stuff.
Social Security is separate, just checked my own salary sheet and it's 11% for a regular employee. The employer pays the rest, if you are both employee and the employer you must pay both parts.