Yes,Poland has a bigger army,but they fall WAY behind Economy Wise compared to Germany. Meaning that Germany can have a higher budget for Military during War Time. So yes, Poland would've been able to hold up initially,but struggle in the long run.
You’re referring to old data. It is true that in 2023 Poland was temporarily ranked higher in the international PowerIndex, but the 2024 PowerIndex shows Germany width a higher ranking once more.