Is Hextech Singed even Hextech, or should it be renamed to Chemtech?

Chemtech generally works like Hextech, but the difference is that it is powered by chemicals instead of the hextech crystals. It doesn't necessarily have to inject chemicals in your body, it is really just defined by being powered by chemicals. It can inject them in your body in many cases, tho.

And what Atgo was talking about: Read Vi's lore. She got the Hextech gauntlets when she started working for Piltovers police, but before this happened she rescued some people by building some gauntlets on her own by using parts of a mine golem. This golem was "chem-powered", therefore the technology she used in this first case was Chemtech.

You're right, Vi current gauntlets are Hextech. But I wasnt talking about them, I was talking about this:

The final straw came when she worked alongside another gang on a smash and grab heist at a chemtech facility that had just struck a rich seam. Listening in on miners’ chatter in the bars, Vi learned when payment for the ore was being delivered, and hatched a scheme to relieve the mine’s owner of his gold. The plan required extra bodies to pull off, so Vi reluctantly brought the Factorywood Fiends in on her score. The job went to plan until the leader of the Fiends used a chem-powered mining golem to kill the owner with its oversized Pulverizer Gauntlets. His men drove the workers into the mine as he started demolishing the opening, driving the golem into an overload. This wanton slaughter and destruction infuriated Vi. It had been a perfect score and now these psychotic idiots were ruining it!

Grabbing their share of the gold, the Fiends made their escape, but the miners were now trapped below ground and would soon run out of air. Vi could not leave them to die, and swiftly donned the overloading golem’s powered gauntlets before it tore itself apart. The wrist mechanisms clamped down on her arms, but Vi endured the agony long enough to smash a path through to the miners and save them from certain death.

With the miners free, Vi and her gang fled with the rest of the gold. And the following day, Vi paid a visit to the Factorywood Fiends. Still wearing the powered gauntlets, she administered a beating to the entire gang that is still spoken of with awe by the gangs of Zaun to this day. The debacle of the mine robbery was the last straw for Vi, and she swore never to work with anyone she didn’t fully trust. She kept the Pulverizer Gauntlets, and had them modified so as not to burn her whenever she used them to break into supposedly impregnable vaults or ambush heavily armed convoys of gold, tech, or whatever else she decided to steal.