Hopefully a resorts board moderator or a webmaster will move this thread to the DVC Forums.
When is your use year? If you have banked 2019 points into your 2020 use year, the earliest they will expire is January 31, 2020 (February use year). If you have a later use year month, then adjust accordingly. You are still able to bank your 2020 points into 2021, I would probably do that just to be a bit safer. It can be done online in your DVC Dashboard.
With that many 2019 points, it would not surprise me if you indeed lose some if you have an early use year month. That is a lot of points to try to use up. I've already banked most of my 345 June use year points to 2021. If worse comes to worse, and I have to cancel a January reservation, I'll lose 46 banked June 2019 points, unless I book again before June, which I'm not planning to do.
Member Services is pretty overwhelmed with people trying to use the 2018 banked points that were extended due to the virus for a few months, until November, I think...I don't remember as none of my points were 2018. THose points can't be booked online and have to be used manually via a phone call to member services. Your 2019 points should be usable, depending upon availability, online.
Member Services phone hours are Monday to Friday 9 am to 9 pm Eastern, and Saturday & Sunday 9am to 7pm Eastern. Given that
Disneyland has pushed back their park opening even further, and that virus cases are skyrocketing in Florida, I'm taking a wait and see approach.
Good luck to you.