Maybe he means additional walls you gain when you went up to TH9
Anyway congrats OP, I myself having trouble maxing walls to skulls at TH8 now
nice . Its totally possible, just need more time.
I could have done in 20 days if i was only focused on walls, my priority was always other 4 builders, never kept them free for 1 min even. they took 80 million of G+E for other upgrades. those 80 mill could have ended my walls way earlier.
I will still only use 4 builders for other upgrades, will keep one free for lavas so that by the time i max out th9 my walls are also lavas.
Been th9 for about a month and have done 83 legos only but have been doing defenses
I'm about 4 months into TH9 and I only have about 50 Legos. :(
legos xD
you know there are 4.786.777 other player with higher walls and better base