It matters in so far as you are making life more complicated for yourself than it needs to be.
Have you tried the native STL importer ?
Why did you get a third-party tool ?
As Mike said, it may be that it imported the STL - perhaps at an enormous size - perhaps you mis-set the units ?
And the model zoom is now so great it is broken, so that nothing is visible…
Try using Edit > Select All and see what’s reported in Entity Info.
If more that the original template’s ‘human-figure’ is listed then reconsider redoing it in a new empty model, this time checking that the units are correct - e.g. if it’s in mm and you chose m it’s then x1000 bigger that it should be - and therefore perhaps many km across - which will break SketchUp’s zoom etc.