Sony Xperia 10 plus SalfishOS and Android 10

Does 10 plus have touchscreen issues on salfish after a10 install? And why need to install a9?

Welcome to the forum. With regards to Android 9 installation you might like to look at this resource concerning baseband:

why android 9 is better for instalation then android 10?

it is not better, it is mandatory.
sf is built for android 9 firmware and drivers.

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The touchscreen issue you probably read about is hardware related.
So, no worries when installing SFOS.

one of those threads

After insalling a new battery my touchscreen problems went away.

I think it’s a question of bad assambly by the manufacturer in the first place, possibly the battery-plug cover.