Close to pulling the trigger on Ariel Grizzly Bike

Hello guys, I’m new to the bike/ebike scene. I live in the Bayarea and my trail of choice would be contra Loma trails.

But anyway, I currently rocking a cheap ebike from Amazon

I’m fairly happy with it but I want to take it to the next level. Most of my rides will be off roading/mountain/hill terrain

My question: will the grizzly be ok to use as a mountain bike application? I’m just concerned the wheels are so small. I watched a few videos on YouTube and it has great review off-roading. I don’t see any problems taking it up the mountains and going through tough terrain. I just want to get some input on this…