If you're actually trying to assess his goalscoring ability properly them npG/min is the correct measure, not total goals or goals per appearance. Because obviously someone who fractured his cheekbone, had covid twice and doesn't take penalties won't have had the opportunity others had to rack up the total goal tally. That doesn't change the rate at which he scores goals in open play though.
Serie A seasons by that measure, with Osimhen's best season and the seasons equal or better to it in bold.
Osimhen: 0.57,
0.64
Lukaku: 0.51, 0.56
Tammy: 0.41
Lautaro: 0.33, 0.44, 0.53,
0.71
Immobile: 0.49,
0.74, 0.35, 0.62, 0.51,
0.66,
Vlahovic: 0.30, 0.46, 0.58, 0.59
So of the 17 combined seasons I looked at from the strikers you mentioned, not counting Immobile's seasons in Serie A before his return to Lazio, only 3 saw returns at the same or better rate than the best of Osimhen's two seasons so far and only 6 saw returns at the same or better rate than his
other season.
When you then take into account the fact that his returns are backed by consistently strong underlying stats (93rd and 91st percentile for NPxG) and he's still only 23 years old then
@Red Indian Chief Torn Rubber's claims about his goalscoring hold water.