There might be something that is lost in translation from English to Swedish, probably. But if speaking of strictly mathematical average, you are wrong. You are talking about mathematical
median not
average.
Small example. Let's say we have following beard growth rate among 5 NHL players:
1. 10.00 (unit: furlongs per hectofortnite)
2. 0.02
3. 0.01
4. 0.00
5. 0.00
Among those 5,
mathematical average is 2.0, and there are exactly 20% guys that are above average and
exactly 80% guys below average.
Among those 5,
mathematical median is 0.01, and there are exactly 40% (in large groups actually 50%) above and exactly 40% (in large groups actually 50%) below median value.
Thus your statement "But saying that a player is average at best implies that he would be in the lower 50% of the league" is just false, strictly mathematically speaking, and also false if you use average as layman terms, like I guess Ippenator used in the first place.
To correct your statement so that it's not false, it should be:
"But saying that a player is
median at best implies that he would be in the lower 50% of the league" <-- that is true, but I don't think
@Ippenator did ever mean that.