Spookston isn’t an incredibly bad player, but he does cherry pick his matches, you can also see his full statcard ingame.
That being said though, CC’s stats should never be taken into account for BRs and whatnot, though whenever they post a vid of something the actual K/D of the vehicle ends up really skewed because there’s usually an influx of people playing the vehicle after an upload
He doesn’t even have good stats in his T58 compared to his other tanks. If they were actually better than his other vehicles, then maybe he would have a point, but no.
9.0 might be pushing it for an unstabilized not mobile vehicle, but at minimum it needs to be 8.7 along with the Turm III. I haven’t had a ton of issues facing the T58 with 8.0 Sweden, but I do think it should go up if it keeps it’s reload.