If you like it or not, it would be more effective beginning to use git rather than subversion control tools in the long run. Sooner or later FreeBSD will be migrated to git. For portsnap users why using subversion control tools now? In the mail no deadline for portsnap(8) is given. Maybe it can be used until then. If not, using git would be the logical choice instead of svn(lite)/svnup.
From the April, 2020 - June, 2020 FreeBSD Status report, Git Migration Working Group:
"We expect to be ready for the migration in the next quarter."
From the April, 2020 - June, 2020 FreeBSD Status report, Git Migration Working Group:
"We expect to be ready for the migration in the next quarter."