It's definitely censorship, but here's some food for thought:

If they simply deprioritised the txs they didn't like but would include them if the mempool was empty, is that censorship or just natural selection the same way miners prioritise high fee txs, while others might prioritise their friends' txs.

Also, Bitcoin is censorship resistant, individual miners were never supposed to be censorship resistant. Stop panicking and let game theory play out.