@Learn bitcoin was right on what he said below.
Even though they have regained access to their support center, the hacker still has a chance to use email spoofing and send emails to those Trezor users and try various hacking attempts like sending malware and asking them to download, or asking them to use new web portal which could be phishing and numerous more methods they may try. There are still a few percentage of people who might believe those emails and try those things.
This was my basic assumption. If hackers get a list of specific service users, I am sure they will try to trick them. Approx 66000 users' data were leaked from the hack. But, how many of them are aware that their data has been stolen? Almost 90% of them don't know that their data has been stolen and they may face some critical threats. This is unfortunate. Even though Trezor started to give warnings to their users, yet there will be users who may fall for those phishing scams.
Well it's good to let people know about this current situation, I'm not a trazor user but I'm always concern in knowing all this kind of event because in less than no time I will purchasing a hardware wallet and will not want to face this kind of risk using them.
You should have some basic understanding of how social engineering works and how phishing works. When a user open their wallet for the first time, it says never share your seed phrase and the private key with anyone. That include Trezor or any other wallet providers as well.