I'd say you're more right TopBunk. There is a significant difference between False Capture's
"DO NOT Climb above SID levels until instucted by ATC" and your
"Due to interaction with other other SIDS/airports, do not climb above initial SID cleared altitude until cleared by atc", that significance being the word 'initial'
If the sid has wording to the effect of False Capture's quote, then I'd climb as annotated on the sid chart i.e. at 5000ft at 12d, at 6000ft at 18d etc.
If it's written as your quote then I'd stay at 5000ft.
Surely the reason for there being a sid is so ATC don't have to issue step by step clearances on dep. If you're cleared the sid, you fly the sid as per the plate. If you're given a local restriction or amendment to the sid level by ATC, then stick to that.