Apple likely doesn't add live lead-ins to their canned product announcements because they don't want to. It's not like this technology/concept is cutting edge. They could easily do this live or film a three minute update a day or two before the event. They could even get Tim to wear a different athleisure outfit and other sneakers. Tim can take a bite of a SoyJoy bar and post the 0.5 second clip to Instagram. The tech has been there for years.
Most of Apple's updates of the "here's where we stand right now" are very high level. Whether they say they were working on it yesterday or two weeks ago doesn't make a difference to Joe Consumer. It's not like Tim's going to say Dr. Chandra fixed HAL 9000 bug #65483145 a few minutes ago which will be pushed out in the next macOS update.
The only thing that really counts is product QA at release. No one really cares about what the engineers ate for breakfast if you search for "London" on Apple Maps and it takes you to Ontario instead of the UK.
And how would we know it's a live lead-in anyhow? Tim standing in front of a television with a Wall Street ticker, today's headline plastered on the screen, the score of yesterday's Giants-A's game? Or Tim FaceTiming from his car stuck in I-280 traffic? (which shouldn't be all that bad at 10am PDT and still could be faked/canned). Or maybe he could apprehend the nearest gardener and ask them for the time of day.
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Yes indeed, that would explain the hilariously artificial lighting of the human presenters.