Im pretty fervently anti-Georgist, so it is hard for me to relate.
In my moral-political framework use taxes are superior to income taxes which are superior to wealth taxes. In my mind, any just theory taxation is based payment to the state for state services provided.
Use taxes are best because there is a clear quid pro quo, it enables consent (via using the service or not), and can be leveed reasonably proportional to use costs.
Income taxes are next, because they can be framed as a use of the public market space and institutions. Again, there there is a clear quid pro quo, and people can choose to work more or less, and pay more or less taxes.
Wealth taxes are worst because there is no quid pro quo or consent. The taxed gets no new exchange for the payment.
I think solar tax is even worse than this, because there is no underlying profit or wealth. Im not making money with solar, just losing money more slowly.
I think this is equivalent to sending a collector through the serfs to collect taxes for breathing the kings air. The kind didnt make the air any more than the state made the sun.
With respect to Georgism, I think it was amoral to begin with, and economically outdated today. Simply put, a significant portion of value today does not arise from the land. The material inputs for some code are trivial, but that code created may be worth more than a thousand acres of farmland. The material inputs to make a billion dollar stock trade are a few watts to send electrons down a wire.