Yes that’s… what a safety factor is. You add a margin on the worst case scenario to cover what you didn’t foresee. When discussing something online, especially off the cuff, adding in safety factors especially when it’s something you’re biased towards is just good practice.

For example, things that add into that safety factor are things you’d want to include when doing the same discussion on ICE cars, where the HVAC can impact fuel economy substantially. Something that isn’t included in the analysis from above.