It's not because they're no longer needed once the panel is produced. That would be analogous to the sand and copper and steel and indium and cadmium and gadolinium and chromium and zirconium and nickel and silver in the nuclear plant (and fuel cycle). All of which except silver outmass minerals of similar rarity and mining impact in the solar panel (and that is quickly changing). Even then it's questionable because most of the nuclear reactor cannot be recycled, but the solar panel legally must have recycling prepaid in many jurisdictions.
You're welcome to include mining for the entire supply chain of solar and exclude the supply chain of the generator for thermal though, it doesn't change how one sided the land use is in solar's favour.
You're welcome to include mining for the entire supply chain of solar and exclude the supply chain of the generator for thermal though, it doesn't change how one sided the land use is in solar's favour.