How do you know Tefera was not in 3:27 shape at the time? It has been already pointed out to you, that several elite runners have their PRs from an indoor season. Could be because of many factors like injuries, wrong planning, financial incentives, mental state, luck, etc... Once again, Ethiopians are most unconsistant runners and their shape is hardly predictable.
Also I can bet a house that Cole Hocker will NEVER touch 3:30 indoors. That's a 3:47 mile shape at least and Hocker ran 3:50 two seasons in a row.