According to the news from March 21st the transition phase from s6opts to 66 tools has by now officially ended as of May 21st 2019.

The 66-repo is no longer available. 66 tools were merged into obcore.
  • Make sure to always update your installer if you make a fresh installation!
  • If you're on a stable system double check and make sure to remove 66-repo from your pacman.conf!
The current pacman.conf structure above the arch repositories 
IgnorePkg   = systemd
IgnorePkg   = systemd-libs
NoExtract   = /usr/lib/libsystemd*.*

# [obcore-testing]
# SigLevel = Required
# Server = https://repo.obarun.org/obcore/testing/

[obcore]
SigLevel = Required
Server = https://repo.obarun.org/obcore

# [obextra-testing]
# SigLevel = Required
# Server = https://repo.obarun.org/obextra/testing

[obextra]
SigLevel = Required
Server = https://repo.obarun.org/obextra

[observice]
SigLevel = Required
Server = https://repo.obarun.org/observice
you should do 
IgnorePkg = systemd
IgnorePkg = systemd-libs
instead of 
IgnorePkg = systemd systemd-libs
I didn't know there is a difference, I have used it as a single line with many pkgs and they have been ignored always.

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