If it's not misleading, then it wouldn't be impacting "impressionable kids". They're misled to believe that there won't be a negative consequence.
Young adults actually have processing problems over impulse control [0], and so cannot see any drawback to "not now" - in fact they likely do not have a way to fully conceptualise that something will occur in the future.
All "buy now, pay later" translates to is "instant gratification", nothing further.