Anzac oob

[Mobhack]

The chance of buying a tank coy is 40% if it has 1500+ purchase points remaining, so there is a chance it never buys a big blob of UK tanks.

for 1 pass - 60%
for 2 - 16%
for a third pass through - about 2%

So there is a chance no allied tank coy gets bought, but its rather small, assuming its got enough points (and 4K points wont drop below 1500 remaining on 3 passes through the buy loop, even if say a battalion of arty was bought each time).

There is a tank platoon buy as well, on lower remaining points, again there is a chance to skip that buy, too.

MG, ATG etc are bought in meeters or defending - not much if attacking (which it is here).

so - you have a very low percentage outlier condition there where it decided not to buy the allied UK tank coy several times over, and it looks as if it skipped the platoon tank buys as well.

ANZAC though is not a "tankie" orbat, especially against Japanese. It does have a boost in the desert with UK air, tanks etc as allies, but these are subject to dice rolls. The battle you have there simply rolled a shed-load of of 1's in the buy routine.