Really, no. It's standard security protocol, and sitting Presidents get this treatment everywhere they go; it's been this way since Kennedy's assassination. The Secret Service will not allow them to use any kind of commercial transit, and they cannot even drive themselves except when they are on their own private property. When they travel domestically, they normally use a motorcade of at least 8 cars on the ground, and there are always 3 identical helicopters flying together, so that in the air, no one firing a surface-to-air missile would know which one he is actually in. The President also has a large team of Secret Service agents and military personnel who travel as well, somewhere upward of 100 members of staff (true number is secret, of course), but they come ahead to get the vehicles ready, plan the ground route, inspect the guest quarters where he will stay to make sure there are no cameras or listening devices, position snipers if necessary, make sure that the US cars will have room to maneuver, etc. Nothing is left to chance; they even bring the fuel for the vehicles if there is no US military installation at the destination. It's a traveling circus. Ex-Presidents can travel on commercial flights if they prefer to, but they normally have to take 2 bodyguards as well, and their presence is disruptive for other passengers, so it's more common for them to arrange rides on corporate planes.
When Biden arrives for the funeral, you will see men in dark suits take up position at all entrances to the building, and a few will enter with him and take up positions inside within line of sight of Biden. One of these people will be in military uniform and have a briefcase. That's the case containing the nuclear launch codes; it goes wherever the President goes.