Only...
Even though, based on the stance of the Deities at the time, their reaction was absolutely correct. But regardless of whether the thoughts of the Deities at that time were correct, their reaction after the Treants appeared was destined to lead them to unfavorable outcomes.
The Treants who formed the final defense line were surely not negligible entities, and now, when those Deities didn't regard them seriously, the Treants did not abandon their duty. As a result, just as the Deities rushed towards the Deityhood, they initiated an attack on their own accord.
In contrast, because their mind wasn't focused on countering those plants, when facing the coming Plant Bombs sent at them at the time, the Deities merely tried their best to dodge, and as for counterattacking, they honestly hadn't considered it back then.
Thus...
"Boom Boom Boom!"