Its not bunk. People are comparing two widely different things and not understanding the difference.

The price of $150 is capacity of a battery. If i want a battery that can store 4 kwh i pay $600.

The other number referencing $55/MWh is referencing levelized cost of storage. I have a a MWh but instead of using it right now i store it for 4 hours. Now this MWh costs its initial price + $55.

Apply this example to a KWh where i would pay $0.1 for it if i used it right now if i want to store it for 4 hours and use it later i have to add $55/1000 to the price or about $0.055. So a directly used KWh would cost me $0.1. One stored for 4 hours would cost me $0.15.

Hope that makes sense and explains these different numbers.