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The filter operates on lines that contain 'ABCD|' anywhere in the line. Use grep to find them.

The first sed command filters out only lines that contain 'ABCD|' and passes them on unchanged,...

oops yep I was wrong there.

I oddly missed that '/' was the deliminating character for the regex pattern and therefore the p on the other side was actually a sed command.
I guess the '|/' threw...

Mmmmm... no.
The string 'ABCD|' is a literal, the rest '/p' is the end of regex ('/') and print command ('p'). So the first sed command

sed -n -e '/^.*ABCD|/p'
is an instruction to print only...