I agree it is confusing
per that thread it means you've met one of the criteria already, 30 days. whats needing measure is how much bac built up during that time, on the substrate where filtration ideally should be located. so the shrimp you used provided fine ammonia traces, good to go there. if you didn't add any bottle bac, and only natural seeds were used, then you can run a digest test from that thread at 1ppm and you are likely close to done but the test will tell.
if you've added bottle bac this will be sped up, and 30 days is prob long enough for sure. do a digestion test from the thread we will know your cycle in 24 hours if its done
you have met the known submersion time frames for group A cycling. now we just need to test to know if its done, shrimp cannot be used for the digest test it must be liquid ammonia so that 1 ppm is attained, verified, then reduced to zero by this time tomorrow. if your kit doesn't show a full digestion test, don't begin reefing till it does and simply hold course or add bottle bac to speed up