You're ridiculous. You can say 315 is achievable in a year. 450 lbs doesn't even get on the charts for any weight up to 310 until intermediate level according to this chart [0]. Nobody with any sense considers themselves to be an 'intermediate' lifter after one year.
These are self-reported numbers mostly from novices on the Internet. I can assure you these do not represent consistent and specific training for this lift.
One order of magnitude is a mere 45 lbs deadlift. Thus the poster must be horrifically weak. He must have wrote that from the nursing home, I'm sure the nurses love it that he spends his days quietly posting nonsense on the internet instead of bothering them.
450 is almost the expectation for anyone casually lifting for a few years.