That’s what I thought, but I reread the chapter (224) and Lin Chen just needed to train him for a year to achieve Super Saiyan 2 without the HTC, which he did already.
"Don't worry, Vegeta. I also have a Hyperbolic Time Chamber here. You can go with Trunks in there," Lin Chen suggested, handing over the one he and Broly had used before.
Anime & Comics · dm95
Thanks for the chapter
Sweet*
On The Bench
Anime & Comics · ReadingDangerously