I cant open your image files. I'll say this however, a "vulch is when the tires are on the ground. And not just "on the ground" but right after spawning.
I dont believe you can run from a fight, for whatever reason, circle your ack, then touchdown your wheels, scream foul when someone kills you. Its not like its "game over" just cause you flew back and touched the pavement. And this guy didnt even do that did he? He just circled the base.
To me a "Vulch" is a prolonged session to pad your score. All teams do it. Ive watched a map and seen a base cap go on for many long minutes. OK so I up a Hellcat with ords and fly over. There have been times Ive flown over the town and seen not one building touched even tho these guys have been running up and down the runways for 20 to 30 mins. Now THAT is a vulch.
Your example is just plain good flying on your part and the kill was perfectly acceptable. When I run out of gas Ive ran to my own ack, circled until I slowed enough to land, and if I get killed then its on me and my tactics were poor.