I just switched to the SU 2 beta which was published today. I did not see “excessive trees” mentioned but I did see a reference to a corrected tree line on the Canary islands in the Release Notes, so I gave it a try.
And wow, it’s like night and day, really! 
Roque de los Muchachos, La Palm until SimUpdate 1 (I posted this image further up already):
With SimUpdate 2 Beta (1.4.7.0):
(Both screenshots without Bjians Season Enhanced mod. Tree density high in SU 2 Beta.)
And it even gets better: The caldera around the Teide volcano (on Teneriffa) is now almost void of trees, just some bushes around.
Until SimUpdate 1 (on right side, left side is a photo)
SimUpdate 2 Beta (1.4.7.0):
You can now walk there and see the Roques de García from the ground, just like in reality.) That was impossible before.
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Another area that’s vastly more realistic now is the Atacama desert at the location of the “Sajama Lines” mission in the “Geoglyphs of the World” WP collection. No more forests in a semi-desert at >4000m altitude, just very rare bushes … and grass. 
And the Etosha salt pan in Namibia looks better now, like 2/3 of the trees are gone now.
I still wonder if I have done a mistake, it’s almost too good to be true. 
That said, excessive trees aren’t fixed worldwide yet, but it’s a good start. Thanks a lot for fixing this. Keep up this work and I will soon enjoy VFR flying in FS2024 a lot more than before.