I will make a thread on this soon because I was impacted, but yes, all of your channels are at risk
A channel of mine that has been inactive for years was flagged with duplicate content 2 years ago & I left it alone because I didn't really have a strong desire to use it, then just a few days ago all my active channels were suspended due to "related channels"
YouTube isn't the brightest and you can get away with a lot, but sadly the moment you link any two pieces of info together (ID, AdSense account, tax info) those channels are bound together with superglue