Based on the way he posts his combos, I don't think it's him. However:
I've found a pretty damaging wall combo, it does involve a grab so it can be broken, but powerfull off 1 bar Nonetheless, and isnt range specific. You need to time your grabs slightly
33_99B BE> W!> A+G> W!> 623B >B!E!>4B= Varying DAM, depending on clean hits and the GB version of 33_99B, but this combo reached 143 DAM with no starting GB and 1 clean hit. I imagine it could do even more than that.
While it's fancy the same amount of damage can be reached with less risk but using his bread and butter A+G wall combo (11_77B after A+G), also it's important to assume all my combos written here are on the 1P side, otheriwse they won't work properly:
33_99B BE ~ W! ~ A+G ~ W! ~ 77B ~ B!E! ~ 4B = around 140 dmg
Also this one:
33_99B BE ~ W! ~ A+G ~ W! ~ 33_99B BE ~ B!E! ~ 4B = around 130 to 140 dmg (got 156 before with one 33_99B GB)
Since I'm on the topic of wall combos, this is the bread and butter A+G wall combo that I use:
A+G ~ W! ~ 77B ~ B!E! = around 120 damage more or less.
Another less damaging but also consistent wall combo:
A+G ~ W! ~ 99K ~ W! ~ B!E! ~ 4B = around 100 damage
A+G ~ W! ~ 99K ~ W! ~ 623B ~ B!E! ~ 4B = around 120 damage, not worth it imo because of the other combo
A+G ~ W! ~ 99K ~ W! ~ 623B ~ RCC A+B ~ 6 ~ B!E! ~ 4B = the damage will be around 130, but you need to get lucky 3 times, so it's not very practical.
Here's a higher damage combo for A+G wallsplat, it's only slightly more practical although it uses meter and is very flashy:
A+G ~ W! ~ 99B BE ~ W! ~ 33_99B BE ~ B!E! ~ 4B = around 125 damage. 136 dmg with one GB.
There's also this one:
A+G ~ W! 99B BE ~ W! ~ 11B ~ B!E! ~ 4B = around 128 damage, no GB.