They are specifically calling it a "fuel and inflation surcharge" and not an "inflation and fuel surcharge" or even simply an "inflation surcharge." Fuel costs are at least 50% of the public explanation for this fee and there is no reason to believe that fuel prices will be this high next month let alone permanently.
Our actual YoY inflation is significantly higher than 5%, so this does not sound like an excuse to pass off a temporary increase to my ears.