This doesn’t work. It did briefly, but got hotfixed. Blessing of sacrifice can no longer trigger teckoning like that.
They can only /sit /stand exploit themselves to get reckoning charges.
I do believe there is evidence of these kinds of macros working in vanilla, but it is still an exploit considering that blizz specifically tried to prevent /sit from triggering reckoning charges.
I suppose they could fix it without messing with spell batching by removing the guaranteed crit on sitting targets. Can’t macro workaround that change.
I’m not sure how they can fix the HoJ macro exploit. That one is a messy mechanic.