In this case, the camel is more like a Trojan Horse. Passing through the Eye of the Needle (yes, it is an actual place) was a reference to one of wealth who has his life consumed with the Earthly pursuits instead of God.
Rich means your attitude towards your nominal earthly possessions. If you allow demons to get a foothold in them and you get transfixed by those demons, that turns them into idols, and you are “rich” in the sense the passage intends. This is not an unforgivable situation. It can be repented, and the possessions once more yielded to the Lord. Some talk about a gate referred to as the eye of the needle where a camel would need to be unloaded and would have to be crawled through. That would be apropos. I can’t vouch whether or not it was the original intended reference (though leaning towards holding it as plausible).