Your reference, at least in this particular quote mentioned in infants so I’m not sure how that translates to teenagers or adults. But, yeah, looks like you’re right in at least high doses or very fast IV infusions, which I think this case covers both a high dose and a very rapid IV infusion. But I believe at what would be considered a normal dose there seems to be very little risk of respiratory depression.
“Consequently, ketamine-induced apnea or respiratory depression are transient and rare in case of occurrence, and result frequently from rapid IV infusion.”