I don’t know that I interpret the article the same way you do, @Matt.Johnson. The “A question from a scouter, annotated” section seems to indicate that the intent is two adult leaders present at all event locations at all times (e.g. one goes to get gas alone and two stay at camp with scouts, or two go hiking with scouts and two stay in camp with scouts), not just two present generally at the overall event. This is obviously the most restrictive interpretation of the rule.
I feel like the article was less clear than it could have been. For example, by providing specific cases and indicating how many scouters are required would be more helpful than the fuzzy language used in the article.
From https://blog.scoutingmagazine.org/2018/01/19/whats-the-difference-between-two-deep-leadership-and-no-one-on-one-contact/ :
“My understanding is, as long as Two Deep is practiced for the overall campout or event, it is always OK for a single adult to be with Scouts as long as there is more than one boy present. Not quite, we prefer to have a minimum of two adults as your previous paragraph described.….”). “Prefer” is not the same thing as “require”. Is it a rule or a suggestion?
“For instance, if half the Scouts stay in camp with one adult, and half go on a hike the the other adult, that is OK. Not a good idea, especially for Health and Safety reasons listed above. If the Scout leader were sick or injured, there would be no adults present.”“Not a good idea” isn’t the same thing as “not permitted”. Again, is this a rule or a suggestion?
As @JenniferOlinger noted above, asking one’s council may be the best reference for this, since they will know both local policies (which may be more stringent) as well as being able to get clarifications from nationals. Always be cognizant that asking for clarification of rules may lead to new rules or implementations you weren’t expecting.