Alexander's offer was so generous that Metztil had little choice but to accept any and all of his demands.
From his wording, it was clear that he meant to 'give' those areas to the men, not lease them like originally discussed.
And it went without saying 100 acres of land for a single family was absolutely huge in every sense of the word.
For context, a Roman soldier after 25 years of hard, life threatening military service only got 12 or 13 acres of land as his retirement bonus.
So when the pigeon holed Helvati heard the proposal, their minds were shattered into kingdom come.
If Alexander was truly being serious, nothing else mattered.
He would agree, and whatever he said following that was like water under the bridge.
Now of course, not the entirety of the 100 acres was going to be good arable farmland, that would have exceeded the realm of generosity and gone into sheer absurdity.