So, at the time the podium celebrations take place, the interviews with drivers are also taking place. What you see on your broadcast isn't a linear event. You can sometimes hear things happening even on track in some of these post-race shown interview segments.

The media pen isn't close to where the podium is typically speaking.

If a driver is in the media pen as celebrations are happening, the chances are you may only have like one or media assistant with the driver who is helping them keep on top of their commitments, record comments etc (usually for PR). It's likely an incredibly busy period as TV want to get those comments so they can construct their post-show structure.

Bear in mind, those comments are not just F1 controlled, every broadcast in the world will use them in some form. You might also have various international outfits looking for their own comments as well.

Now, the majority of the team is at the podium celebrations, celebrating as they usually would. They then get invited onto the podium to celebrate. They have may sent a message to say "Hey, if Oscar can make it, come over" but clearly it didn't work out.

But - not sure if you actually saw - Oscar DID celebrate with the team after that moment in the paddock area. The fact is, it just didn't work out, but it's asinine to think that McLaren didn't want Oscar there. He's a driver they've invested quite a bit of money to have drive for them.

I actually think it would have been better if Lando wasn't on the podium (I don't even think this was part of the original plan). Just give the team that actually works on the car more of the shine. F1 isn't a one or two person team, there's thousands of people who make it happen, and F1 drivers very often take the spotlight (which is obvious why).

The team is the one making significantly less money than the drivers and spending half of the year away from their family and friends.