I don't believe that this interpretation of OP is very charitable.
Regardless of the politics of undocumented immigrants, you have to account for how you are going to service these people. This group is currently living outside of the system.
To combat COVID19, we need them to participate inside of this system.
This isn't actually a bad thing to point out and it SUPPORTS the "undocumented immigrants" cause.
We can't keep pretending that they don't live IN this society.
Acknowledging that as it stands, they can't economically or politically participate in the system is not the same thing as advocating for them to be removed or punished.
If anything, it acknowledges that the current system doesn't work and needs to be re-worked to include this group of people.
Again, 10M people are unable to participate in a productive treatment or cure. This will ensure that we all fail to contain and mitigate this disaster.