I have a few observations about this article.

Generally, try not to use SCP. It has been a crufty old program from the Berkeley R-Utilities, but newer OpenSSH releases have rewritten it to use the sftp-server server instead. There will be wildly different behavior between these implementations.

The backend SCP changes are documented here:

https://lwn.net/Articles/835962/

If you need something that SFTP cannot do, then use tar on both sides.

PuTTY has implemented their pscp to prefer the sftp-server for many years, in a long prediction of the eventual abandonment. Their pscp implementation is a better drop-in replacement than the OpenSSH solutions.

The allure of SCP is retry on failure, which is somewhat more difficult with SFTP:

  until scp source.txt user@target:dir/
  do echo target down; sleep 300
  done

Converting that to pscp is much easier than SFTP.

I also have an older rhel5 system where I am running tinysshd to use better SSH crypto. Due to upgrades, NFS is now squashing everything to nobody, so I had to disable precisely these checks to let users login with their authorized_keys. I can post the code if anybody is curious.