Obfuscate your information before you hit the delete button!
Change your name, change your address, change the email to a throwaway, etc.
Yes, they -might- delete your information when you ask, but do they deserve your trust that they will get this right? If you are deleting your account you implicitly are saying you don’t trust their ability to manage this situation the way you would.
Keep in mind one likely outcome of this event is that they go out of business. Whoever buys their assets may well end up with a trove of data that includes your details.
At least for internal/statistical purposes.