This entire prime years of production argument for a call up is somewhat silly. Each player has an individual arc and I doubt there are many 7th round late bloomers in these average peak performance stats.
Olofsson is already an outlier as a 7th rounder with a real chance at the NHL.
Looking at Cullen's ranking of draft position value based on where players end up in their careers (data from the 1990-2010 drafts).
https://www.tsn.ca/statistically-speaking-expected-value-of-nhl-draft-picks-1.317819
Only 1.9% of players drafted where he was ended up a top 6 forwards/top 4 dmen.
The average ranking on a system of 1- (10 or fewer NHL games) to 10 (generational player) for his draft spot of #181 averages out to 1.55. Thats between a minor leaguer with under 50 NHL games and a guy with only 10 NHL games.
So lets be patient, watch him develop and hope he keeps beating the odds.