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I read it as "breeds selected to be low-allergenic" by the relative orgs that I assume (re)planted them there but I have no real idea about german forests and the processes of planting trees there.

No. Just some trees that produce pollen aren't particularly allergenic.

So by coincidence, not by design then.

I guess they meant 'by nature', but maybe not, which will be fun to hear!

I assume they meant the people who planted those "tree farms", that they chose trees people were less allergic to.

Different pollen have different weights. If you're seeing yellow dust laying on the ground then it's likely to be a heavy pollen that won't bother many people unless they actively stir it up. Example: People with pine allergies aren't really bothered unless they play in the pine needles and stir it up.

Not familiar with the biology of the matter. But I would assume there are advantages and disadvantages to the weight of the pollen in how it disperses and pollinates.