As seen here, no macro was used. This is pserver rubbish and never worked that way in Vanilla.
Datestamp from 2006.
https://www.youtube.com/watch?v=kuPEzEoexLI
Tells you to stack charges and not to attack anything at all. ‘Target yourself if you need to’.
In regards to the actual sit/stand proccing of crit ractive abilities - Can I sit down to force a crit and gain a charge?
Charges will not generate off auto attacks or npc attacks by trying to sit down and force a crit. However, ability crits from physical abilities such as Sinister Strike, Hamstring, Auto-shot, Aimed shot, etc will generate a charge if you’re sitting.
This was later proven to infact happen (as seen in the vid). Upon Classic release Blizz implimented a change. That change is -
Using a work around to get a proc on something that is simply not an intended game mechanic is otherwise known as an exploit. You want rek stacks - do it the old school way where you stand there, not attacking and wait to be crit by whatever is attacking you. The amount of time it takes to get a 4 stack or ‘rekbomb’ balances it out.