I think they are true but tailored to your level of understanding.
Say you're a really ignorant person (not in a bad/offensive way, just ignorant, that's all), but very religious.
Maybe you will see Jesus or something when you die, or the Buddha (what they look like for you in your mind).
Perhaps if you are a new ager you see more cool stuff like fractals and geometric patterns, maybe you see things that astonish you or something.
The experience will be tailored to your level of understanding but never the absolute truth, not until you go further, I think.
Although some people seem to get the more truthful experience, but maybe they didn't have many expectations or something else...
So maybe we are all just lights who decide to take on a form or maybe we are literally just consciousness with no form whatsoever.
But because that is literally inconceivable for many, you will see things consistent to your earthly beliefs.
If you see yourself as a person, you will see what is the divine or God to you. But God is not a person, it is love or positive energy, so you will see that too.
The experience might be more experienced through positive feelings impossible (at least for many of us) to experience on this world.
So strong many would perfer not to come back but they still do because of their family.
So, what is beautiful to you, you will see that, at first, until it becomes more "truthful" (not like anyone is trying to deceive us or anything, but it's a gradual transition, not a sudden one).
The best description that I've seen is that people say is like going back home, after a long trip/vacation.