Hoping that they haven't thought of clearing the road for explosives etc.

Blackwater was renamed Xe and then got bought out by the Constellis Group. There's a Wikipedia page on that somewheres.

shell game detector!

Imagine, if you will, a good old A-10 "Warthog" strafing that convoy

Indeed, indeed!

In all seriousness, I think that this convoy has NOT been attacked by the Ukrainians. Is that right? If so, why not?

My guess is that maybe it's a trap. And maybe they are faking the appearance of being "stalled" to make the honeypot look juicier.

If the convoy includes a ton of anti-aircraft missile launchers, and the Russian air force concentrates their patrols in the area, then any Ukrainian jets and drones trying to attack the convoy might be flying into a kill zone.

Or maybe it's simply that the Ukrainians calculate that they'll get a better attrition ratio by hitting them at the Kyiv defense points than by reaching out and trying to hit them out in the open.

Unknown at this point, except that NPR reports that the convoy has slowed. One or more of those trucks could be carrying nuke warheads, and could very well be a trap. It's pretty much why I think that immobilizing the head and the tail of the whole string would be a safer thing to do.