The Victron Battery Balancer is aimed primarily at the lead acid market, and specifically for those who don't have the ability to individually charge each battery with a 12v charger in their 24 volt system initially.
It is also intended as a band-aid for those who may be series connecting mis-matched pairs of lead acid batteries slapped together ala-carte.
Note in their manual they are addressing the problems of battery balance being a concern not only of bad initial performance, but also that of sulfation from undercharge, and gassing from overcharge - again primarily aimed at lead-acid. And if my eyes don't deceive me, all those batts in the manual appear to be sealed VRLA (agm).
Here, the author is using two nearly identical quality LiFePO4, who has the ability to charge each one up individually prior to series-connection, and quibbling over meaningless differences in balance between these units - which may only appear if you take then down to 99.9% capacity such as in an EV application. Which is not the case here.
If one bms is tripping, then you figure out why and fix it. Unless of course you are using mismatched trash. This kind of shade-tree advice goes along with those who promote not needing a solar controller, and just letting the bms trip upon full charge.
Basically the author is putting needless amounts of additional points-of-failure into his system, obsessing over differences which he'll never encounter in his application, which in the LONG run, do more harm than good.
Where this would be useful is if
1) You don't have the ability to charge individually first
2) You are in the habit of slapping together batteries that are mismatched in age, capacity, overall health etc.
3) You are band-aiding other problems such as poor infrastructure maintenance, cleanliness and so forth.
Just beware of those who try to hawk products for the balance-obsessed, where in the long run, trying to get your voltages exactly equal all the time (within reason), which may have zero effect on your actual ability to draw the expected capacity from them abound. *MINOR* differences are to be expected given there are very minor differences in manufacturing and even bms bleeder resistor tolerance.
Putting this is on two nearly identical Sol-Ark's, previously charged individually - are you kidding me?
It's a nice product for those that need it. For specific reasons. But to promote in the way he did is just hawking "stuff" for a system that doesn't need it - the way he built it.
So NO, I will NOT "like" so you can get more free stuff to slap together.