Depends upon whether the “cheap” aspect holds up in comparison, doesn’t it?
If it’s 10X less costly, then 5X less efficient won’t be all that big a concern. The price to power a well pump, hot water heater, heatpump or a whole house would still be cut in half compared to multifilm if that were the case. Well, less inverters, etcetera which may or may not be equivalent.
Although I can’t say what the potential of this technology will be, it probably won’t be enough to cut your power use.
But probably will act as insulation, so you don’t have to heat or cool your house as much.