So Ra did not initially want to speak about the harvest

[Bring4th_Austin]

And remember that harvest is not always synonymous with the Earth changes. There were two other "harvests" 25k and 50k years ago that were not associated with Earth life changes. The planet was the same before and after those harvests. We are in a relatively unique one where the planet is going through its own graduation while we go through ours. So from Ra's perspective, focus on the Earth life changes was a coincidental happening, not a causative one.

I agree with the sentiment, but just for reference sake, Ra speaks about a somewhat causal connection between one of the previous harvests and some Earth changes:

21.27 Questioner: Thank you. Then did the ending of this first major cycle have something to do with the destruction of Lemuria, or did this destruction just happen to occur at the end of that cycle?

Ra: I am Ra. There is a confluence of energies at the ending of a major cycle. This encouraged what was already an inevitable adjustment in the movement of the surfaces of your planetary sphere.

It was already inevitable, but encouraged by a confluence of energies. So whatever a confluence of energies which comes with a harvest is, it does have the ability to have some kind of effect on the Earth.