I think the question was not how many patients that need intubation are in the ICU but how many patients in the ICU need intubation. I think the suggestion is that the first number is 100% while the second is much lower until you hit a point where ICU beds are so full that only to most critical cases are put into the ICU.
Yes, agree that there is a difference. Regarding Sweden, it seems like all patients in ICU are intubated.
An explanation might be that because of the low number of ICU beds in Sweden only people deemed to have a fair chance of survival is admitted.
[1] is the ICU register that gives some statistics, e.g. that median age is 60 years and 25% of patients don't have any risk factor.