I can't find any source showing the context of the 30-35% claim from US Intel. I can't even find a reliable source of the US estimate of how many fighters they have. The last public numbers from US intel in January had much more detail and said 20% incapacitated, not 20% dead. A jump to +30% of Hamas fighters dead now seems beyond implausible. Especially because USA has also said they don't independently track deaths in the region, they rely on local numbers.
Different Hamas officials have made different claims about their losses, and all the sources seems vague. It's been reported as 6000 - 8000 either lost (could be casualties including injured survivors not able to fight) or dead. And some of them deny the numbers entirely.
25-30K fighters, 20-30% killed, so at best ~10K down to ~5K, assuming their intel is correct. It's very strange that the estimate of killed fighters is in percent and injuries is in absolute numbers. Doesn't make me feel confident they got the context right of the numbers shared
I believe those are still from January, when the total number of deaths was 25,000. So if they are correct then that would result in a casualty ratio between 1.5:1 and 4:1
I'm not sure that matters, since the majority of military casualties are caused by the same side.
So for example, when evaluating the Iraq War you would compare Iraqi civilian to Iraqi military casualties. There is little point in looking at American civilian casualties.