Yes the old guides/strats/videos are outdated since 1.23 since they patched it so you will now get 3 waves regardless.

I feel it was already the hardest of the 7 leves before the patch and now, in my opinion it is harder than the ifrit battle itself.

We tried many different strategies, the one that ultimately won for us believe it or not was WAR WHMx3. Each WHM would take turns casting Holyx2 (via Presence of Mind) on each wave. The WAR would Steel Cyclone & other WHMs cast Aerora.

It was still very close and not sure how feasible this strat is to the general public since all 3 of the WHMs had finished Relic weapons so their Holy damage was increased. After the 3 waves were dead, we would run out to shed hate, have 1 swap to BLM and 1 to WAR.

I have seen many groups try with 3 BLM and leashing them back and forth, but I feel this cant be the intended mechanic and seems to be very luck based anyway whether you can even come close to finishing them off this way in time.