It was the other way around, Philip was trying to conquer Greece and he figured sending a threatening letter to Sparta might be enough, since at that point they were about powerless.
So the invasion was always planned and the courtesy of the answer didn’t matter.
This isn’t completely fair, Bethesda addressed the issue in universe and there are multiple authors arguing about this and why that is. It plays very well with the rest of the lore which is all about conflicting accounts and variety of interpretation.
If I recall correctly the three in-universe theories are (1) it’s an error and there never was a jungle (2) there was a jungle but Talos CHIMed it away (3) there was a jungle when the high elves (Ayleids) lived there, but when the humans took over the white-gold tower changed the landscape to suit them.
Unfortunately, /r/teslore has no fediverse equivalent that I know of so I wouldn’t know where to have this kind of discussion.
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[Opinion piece] Starfield Killed My Hype For The Elder Scrolls 6 (www.thegamer.com)