Billy's legitimate 1M play looks like everybody else's 1M play. If he keeps going and gets even higher scores, the gameplay style will be different in predictable ways, and it will be so different from his MAME "WR" recordings that he will further prove that he used save states on those. There's some irony in that. His "redemption" gameplay will further confirm that he had cheated previously.
The paradox is delicious, no? The more he tries, the more blatant and obvious the original lies become.
In a world riddled with violence, abuse, war, poverty, and injustice, lying and cheating about a 1981 video game clearly doesn't rank among the worst that human beings are capable of.
The real shame, as with any sociopath who can have a decent night's sleep after dissembling to their nearest and dearest, is the effect the mendacity has on others, particularly those whose trust was honourably placed in them. So Walter Day and Richie Knucklez, and other friends of billy end up being tainted with the same rancid bucket of horseshit as he does.
A man who can barefacedly lie to, and then enlist HIS OWN CHILD to help his 'redemption' efforts is truly a special kind of person. 'There's a level of difference between people', and it translates into some aspects of basic human conduct.