Yeah I already get that. Each individual instance of a coin flip is an INDIVIDUAL instance not affected by whatever happened in the past.
But you are only looking at it from this perspective of the one single individual instance, whereas I am looking at it over the entire span of time and all instances. From that point of view, even though you cannot predict an individual flip with any greater accuracy than 50/50, it is still the case that flips occurring in statistically heavy regions of the entirety of all instances (heavy in either direction) are more likely to skew, over multiple instances, back toward the mean. So you can look at a swath of X flips and, because that X occurs within a larger Y which is heavily skewed toward heads than tails, know that it is more likely that X in total will average heavier toward tails.
And therefore within that region, you can know that any individual flip, still 50/50 in terms of its individual odds, is actually part of a larger statistic skewing in one direction more than another. That is quite simply and obviously because it is far less likely for you to flip a coin 1000 times and have them all be heads, compared to flipping a coin 1000 times and having some be heads and some be tails.