You are confusing the years:
The fast course in Chia, Sardinia was in 2016! Otherwise you are right.
By the way about Chia, 2016:
See that JI is beating 19 year old Jimmy Gressier with 13 seconds. When Gressier came away from JI he won the U23 Cross Country EC 3 years in a row.
See also the 19 years old NCAA hero Josh Kerr finishing 32 seconds behind JI.
And see this years u23 Cross Country silver medallist (and last years U20 bronze medallist) then 17 years old serb Elzan Bibic finishing 49 seconds after JI.
In 2017 the Cross Country EC was run in Samorin, Slovakia on a more challenging course. That is why that times of that year were less impressive. This year the course was also quite challenging with many sharp turns and rather hilly.
Nico Young vs JI: I can´t find Nico Young´s exact age but Young´s 2019 1500m best equals JI´s PB at 14!