persistent-encryption question

[paul@gilbertson.biz]

I successfully created custom buster iso.  But my persistent-encyption 
was not detected by the live system I created.  I of course did include 
cryptsetup in package list.  I read some archived emails and they seem 
to indicate that the boot append live setting persistent-encryption=luks 
from stretch needs to be "luks1" in order to work on buster.  Is that 
the only change necessary for "persistent encrypted" to work?

Thanks,
Paul