I'm always impressed at solo videos and how they are done, however in this particular case I suspect there is some foul play involved. I don't understand how the Animus sits on 96/100 Anima for the entire fight, thus completely eliminating the soft enrage mechanic and making it look not all that hard at all. The hard enrage isn't exactly tight, assuming they could kite the small bots for long enough at the start I'm sure just about anyone could do it.
If there are 25 small adds each with 4/4 Anima each on the pull, why is the Siphon Anima somehow not picking up this missing 4 Anima? If this was a legit strategy then why the hell did we waste months and months messing around with the Massive Anima Golem, when clearly we didn't need to?