I don't understand how that prevents the Anti-Waste League and the Geddes Axe.Actually, to prevent this, you must prevent the fall of Asquith government, which would firstly butterfly away the repeal of Land Value Tax introduced in 1909. Going back further, they could listen to Keynes and prevent total conscription in late 1915 would lead to much lower debt by the end of the war. Winning the Turkish front would destabilize the pro-conscription faction.
In any case Post 176 was to show that there was scope for a large increase in taxation after the POD of 1929, not whether the Geddes Axe should have happened or not.
P.S. I haven't read the links about the LVT that you provided, sorry.