How to delete MacPorts user after using the Migration Assistant

My 2012 MacBook Air (11", i7 2GHz 8GB RAM) crashed and I had to erase the SSD and re-install macOS High Sierra with the Internet Recovery Mode tools. Once I had the working OS, I used the Migration Assistant to rebuild my system from a Time Machine backup. Upon restoring my system, I ended up with MacPorts as a User. I am at a loss to understand why this happened and am wondering if I should get rid of it?

$  port installed
Error: Current platform "darwin 17" does not match expected platform "darwin 16"
Error: If you upgraded your OS, please follow the migration instructions: https://trac.macports.org/wiki/Migration
OS platform mismatch
    while executing
"mportinit ui_options global_options global_variations"
Error: /opt/local/bin/port: Failed to initialize MacPorts, OS platform mismatch

I had originally started this computer with macOS Mountain Lion. I'd installed MacPorts when using macOS Sierra. Prior to the crash I had macOS High Sierra 10.13.3 (and that is what I have now).

As I recall, I've only used MacPorts ever to install one thing - I think it was Valgrind (which is not functional in High Sierra - so I don't need it). Of note - there is not a "MacPorts" User that I can login with or see in the Sys Prefs >>> Users & Groups:

...but there is a "macports" directory in /Users/:

Any ideas on why Migration Assistant would create a MacPorts user? Thought on how to and whether or not to nuke it (and any other MacPorts components?)

Update:

I removed MacPorts per their instructions: https://guide.macports.org/chunked/installing.macports.uninstalling.html

...and I removed /opt/local/bin from my $PATH, then deleted /Users/MacPorts.

Upon rebooting, MacPorts is still a User that shows up in the login screen. Also I get the following from dscl:

$  dscl . list /Users | grep -v '^_'
daemon
Guest
macports
mixelpix
nobody
root

How do I get rid of this?

Solution 1:

$  dscl . list /Users | grep -v '^_'
daemon
Guest
macports <--------------------------------------------- remove?
mixelpix
nobody
root

$  /usr/bin/dscl . -search /Users name macports
macports        dsAttrTypeNative:name = (
    macports <----------------------------------------- confirm...
)

$  sudo /usr/bin/dscl . -delete "/Users/macports" <---- DELETE
Password:

$  dscl . list /Users | grep -v '^_' <----------------- GONE!
daemon
Guest
mixelpix
nobody
root

Also useful: sudo ls /var/db/dslocal/nodes/Default/users

Similarly, to delete the group "macports" use:

sudo /usr/bin/dscl . -delete "/Groups/macports"