Yes. If sports does not happen in a vacuum then comparisons are unfair. If I go to the moon and break the record for long jumping should I be applauded?
Never thought I'd see the day ragebait made it to HN. Yes, let's pretend doing a long jump on the moon is comparable to running a marathon at its prescheduled time at its prescheduled location. Weather is always a factor in sports that take place outside. Might as well put asterisks on all accomplishments that took place on sunny days by your logic right?
Not sure I understand what you mean by "scientific." If you mean exactly reproducible, then almost nothing in athletics fits that definition. Every record in baseball, football, etc. would fail that definition.