If they are for Gaza but then push the same propaganda of Turks killing Kurds and white washing the crimes of the Marxist terrorist organisation, know that you are dealing with a western shill.
Well, those who support Gaza and the Palestinians in the West are the hard left people, so it is natural for them to also support the Marxists/Communists from PKK.
They support all Marxists everywhere, and they oppose what they call “imperialism”. In their world view, Israel and Turkey are both imperialists, because they are strong capitalist countries with powerful militaries. You will notice that this group of progressives are against Israel, Turkey and Saudi Arabia as well. They also hate the US, the UK and Europe in general.
They are basically against anything resembling a developed country, and they support anarchy, terrorism and crime. From petty criminals, drug dealers to terrorists, the left supports them all, because they are “opressed”.
The progressive left hates the military, the police and Abrahamic religions (no matter if it is Christianity, Judaism or Islam). They love criminal groups, terrorist organizations, human trafficking NGOs, LGBTQ+ prooagandists, separatist groups, labor unions and any possible element that undermines the functioning of a developed capitalist society.
So it is normal for Palestinian supporters to also support PKK communists.