When something is "old rules-like," it is not very modern. It is in the past. It is classical.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
Koichi seems to like taking classical poses in photos.
It's super shameful that I was deceived by such a classical fraud.
That classical-style Japanese painter is the pickiest person I know. I can’t understand why she cares so much.