i take it to mean that the definition depends on how you’ve learned about it.
a real world example is world war 2: if you’re an american it started in 1941; meanwhile if you’re chinese, it started in 1931; and if you’re swiss or scandinavian it last until the 1950’s
even in the same country it can be different, another real world example is the mexican rebellion of the early 20th century. if you’re a conservative it went from 1921 to 1931; if you’re not, it went from 1921 to 1923 and then there several followup wars like the cristero rebellion that lasted until 1931
conflicts don’t cleanly start and end; they windup and then winddown slowly and it’s up to you to define where the start and end are; and since we’re all have different definitions, others will have different dates.