Is this considered an exploit?

[Stitch/Glue]

If it was supposed to I think they'd let you throw it directly at the gate. Same with the flamethrower.

You can throw it directly at the gate and it still covers people, I've seen it done many times like that

 

[๖ۣۜZaldarius]

Don't stand near the gate period a pyro will come burn you.

then said pyro will be banned for using exploits

 

[JarlyX]

How is this an exploit?
Uses the same controllable projectile damage as the solider and demo.

Because you looked at TF2Wiki. It's an abandoned project, most if not all moved on to the official one.

 

[Fish]

Yes it is an exploit. You can look at all known exploits here
http://tf2wiki.net/wiki/exploits

Most of these exploits are from the Xbox or PS3 versions of tf2

 

[CagedWalnut]

OF COURSE IT'S AN EXPLOIT

 

[Happy Flygineer]

It's even listed on the Exploit page:

Sniper Exploits

• Splashing Jarate on the ground outside a setup gate will sometimes cause players on the other side next to the gate to be Jarated. (PC/Mac version only)