Now I haven't done any research on this so I may be wrong. The article mentioned the GW4 having the same ratings. Didn't the GW3 and original GW also have the same ratings? Yet Sammy still rejected warranty returns if they saw water damage? I would not trust these ratings unless Sammy explicitly states that they will honor any and all warranty returns for water damage.
I know Sammy is not the only seller that hides behind the fine print. To me though, they are worse than most because they really push that their devices can be used to track swimming workouts, yet they reject warranty claims for water damage.
I'm not sure if they've prominently advertised the GW5 as suitable to track swimming, as much as they did on the earlier iterations.