I thought the 2 second gap was an orange book requirement when tracks are written one at a time?
i dont think that track-at-once
ever would have been compatible with making proper masters.
the normal way to send send masters to a printing house is to make a mac/pc readable data CD and put an image file of the audio volume into it. the question of DOA vs TAO is then irrelevant.
the requirement to create proper audio CDs at home if only physical CDs are accepted as format was limited to the period between 1988 and 1991 i think.
when i remember right it is also against the specs to have track IDs and titles during the audio plays (beginning with the 2 sends gap rule) - but many albums still do that and it works with 99% of the CD players.
but this is so long ago, i might mix CD authoring up with spaghetti carbonara or chevrolet corvette.
orange book... is CD-R! it has its own rules.