she wasn't puffing too much in her presser after the swim, normally they struggle to talk
she said she swicted off a bit in the last 15 metres
Quite often the easiest feeling swims can be some of your fastest. I remember looking up at the clock after clocking off at the 80m and going no way, it didn't feel that fast. Then popping a nut in the final to only go 0.2 faster.
These swimmers are ultra fit - even after a 100m max effort, their heart rate would be below 100 in a matter of minutes. So she would have no problem talking 30-40 seconds after the race.
On the Canadian Penny Oleksiak, the thing about being 16, you can shave 0.2-1.0 off your PB from one meet to the next and sometimes from one day to the next. She's already tasted silver in the fly. Her PB prior to this meet was 53.3. I reckon she could have another 0.1-0.2 in her.