Maybe a helpful starting point, if this is a real question, is for you to define what it is you mean by Marxism and what you find unethical about it more specifically. I’m asking the ideology as a whole, not a specific instance or country that claims to have it. For example I don’t think all marxists would be in agreement about if China’s government is a good representation of marxism (even if they call themselves communists).
Probably unsurprising to everyone here, but this is importantly NOT a severance in most cases. It is a delayed resignation. You submit your resignation but are expected to keep working for the duration of that period and can be fired at any point in that timeframe without any further payment.
Basically they are asking to voluntarily surrender your union protections so you can be shat upon. It is definitely not an offer for 8 month free wages in exchange for resigning