He did and this never ceases to amaze me as you would think that history has shown more than a convincing enough argument against easing off/celebrating, what have you, prior to the tape as the possibility for a record is always hanging in the balance, if you’re a top contender, when form is there (whether you think it is or not).
I still remember Carl Lewis’ 19.75 with his hand in the air meters before the finish. No question he would have taken Mennea’s 19.72 had he left out the pre-finish antics.
Same goes for Johnson’s pre-finish celebrating 9.79, Bolt’s pre 9.69 celebrating, and so on.
Multiple heats is one thing; however, what happened to finish through the line regardless where you are in the competition calendar.
I don’t recall many hamstring pulls at the finish line and any further CNS drain that may happen in the final 10meters or less is negligible.
You never know when your last race might be your last race.