On Raid Boss 3 specifically, I looked at the code and it cannot crit on the initial “jump” attack; since it’s technically an area attack (even though there is no red indicator) it works the same. However, as I said based on the mechanic itself, the damage will vary per person.
The red AoE attack that is followed up after the “jump” attack also will not crit since it is an AoE attack as well.