Each of these terminals can bring in between 50-100 TWh of energy while Germany is adding around 20-30 TWh of renewable energy per year. The obvious reason for the difference is upfront cost. The cost for each of these 50 TWh terminals is around 1 billion euro, while the cost to build 50 TWh of yearly solar capacity currently costs 150 billion euros. So the upfront costs are 150x higher for solar.

Obviously there are differences in costs of operation of the facilities since gas costs money and the sun is free. But upfront costs are the big hinderance for now.

To replace the 800 TWh of energy capacity from Russian gas, Germany would have to spend around 2.5 Trillion Euro, equivalent to 6 years of the German government's entire budget, whereas with LNG terminals it can be done for 16 billion or 4% of the government's yearly budget. Given the extremely tight time window to accomplish the transition, LNG is the obvious choice.