Is that the whole explanation? There's a lot of other ways to make a planet uncomfortable that wouldn't have a mountain of logical consequences to ignore or handwave away, and it doesn't seem like this submission is using any of those. I can accept that it's not going to change, but aside from being hard to believe, it's a waste if the planet is given an extraordinary condition but is otherwise ordinary. If it helps to think of these as suggestions instead of complaints, please do. If it doesn't help at all... at least I tried.
There's no mention in the Ersetu culture of how they cope with the danger of falling down. Given that the kishergal are an arboreal species, and they live on a planet where even falling to the ground from a standing postion could easily be lethal, this seems like an omission. If they're tough enough that the gravity isn't a hazard for them, this is never really stated, either. There's no mention of them being unable to swim due to having bodies much denser than water, which would be the simplest explanation, and no alternative explanation of how they could achieve the same effect.
There's no mention of how they deal with the extreme variation in air pressure on their planet at different altitudes, how they managed to achieve space travel when they'd need awesome futuristic technology even to launch a simple probe like Sputnik out of their deep gravity well, or how funny their voices sound when they breathe an atmosphere unlike their native one... probably because it's not being considered that a planet with 2.3 Gs of surface gravity should have a heliox atmosphere, instead of mostly nitrogen.
There's no mention of the planet having other unusual properties, like a superdense core, or an extreme abundance of metals. It just seems like any other terrestrial world, except for having a higher surface gravity than any naturally-formed terrestrial world would have. There's nothing about the plant life having unusual structure or composition in order to allow trees to grow high off the ground, or why they would be so desperate to do so, like atmospheric conditions that tend to block light near the ground. Wouldn't it be fun if Ersetu had ground fog all the time, and that was why plants had to grow tall in 2.3 Gs?
I think that covers most of the bases. If making sense is so low on the priority list, it seems a waste not to come up with anything fantastic or exotic to go along with the extreme surface gravity, everything else I can find to read about the kishergal just makes them look like a standard race from a standard jungle planet.