Bottom line, UK citizens are represented in the European Parliament, and have a say in EU legislation. If there is a majority in a democratic parliament, well, so be it, democracy works this way... and if the Conservative party decided not to join the EPP, that's the party's decision.
It's a logical fallacy to say that "the country's laws were decided by politicians the people did not elect.", when indeed they are elected by the people.
Actually, the commission is multi-party, split between mostly EPP (Christian Democrats and the like), PES (in which Labor is a member), and, yes, one British Conservative Commissioner.
The UK has zero members in the EPP because the conservatives decided to go it alone; they still have votes, they've just decided to form their own parliamentary bloc, the AECR.
They have the right to be upset. The losers in any political system have the right to be upset. But they lost fair and square in a democratic system, and do not have the right to slander that system and its institutions.
so the statement is accurate