No one experience a now that is still and exactly "now", it is always running past us, even so, we can't imagine any short duration of time where we aren't conscious in this stream, if we try we would still find yet smaller moments, even if they consists of many moments they come together as one moment as small as any. Relative to the conscious existence it's basically a matter of how fast you can realise two points in time, cause you can always get a sense of a now that is smaller than what you previously sensed, it's rather that you loose track of them, just as two points too close together become indistinguishable from one single point. Sensing such a small moment as the planck time is of course absurd but yet that is a series of moments that somehow this moment consists of even though it is made up of many moments. The planck moments themselves are probably impossible even for reality to keep track of, even reality gets confused at that level both position-wise and moment-wise, so in that regard reality should be considered illusionary by the same rules as consciousness would, a series of moments that themselves have no distinct reality but together forms a coherent moment. To cut to the chase though, reality might have several layers of "real", but nothing can't really be defined as anything else than what it is (or rather what it isn't), and that's really at the heart of this idea, that avoid of time and space, time and space arises, and along with that everything that time and space gave rise to, including the existence of conscious beings. Since the state of nothing is unique, the end result should be exactly the same (in this idea, it is the same). So in other words; even though we might be an illusion, when we are not a illusion then that is definitely not a illusion but the actual nothing, and why would that nothing be any different from the nothing that gave rise to space and time? To existence itself? The idea comes with a big IF though, and that is IF existence started at some point and that there was nothing before. One thing that might overthrow the idea is if there are different nothings, that nothing isn't unique, it shouldn't surprise us if that were the case as there are different subjective existences, but it would still be very hard, if not impossible to understand, and could by its own right overthrow the idea that conscious existence is a illusion, how could it be a illusion if it even has its own nothing?