>>54196814Pre-DLC Sword and Shield had very few actual suspect tests. Same with Pre-HOME Scarlet and Violet. It's pretty obvious why - Smogon didn't want to jump the gun and ban something they might just need to unban in a couple of weeks or months.
Garganacl isn't really of interest outside of the lower levels of play. The surveys are weighted based on how good you are, and Garganacl isn't seen as a huge threat in higher levels of play where people naturally carry more counters and more powerful wincons. It's not that a Garganacl suspect test isn't going to happen, but that there are several other Pokemon that Smogon wants to suspect first.