A 450lb deadlift is not crazy.

Yeah 450lb deadlift isnt even respectable among lifters.

450 is almost the expectation for anyone casually lifting for a few years.

But he's also claiming to be fit while consuming 3500 calories a day and pretty much only doing a few 1RM lifts a week.

This depends on the lifter's weight (which is why there are weight classes in power and oly lifting competitions).

For an average male, that should be obtainable in about 6 months to a year.

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.

[0] https://strengthlevel.com/strength-standards/deadlift

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.

A 315lb deadlift is obtainable within a month.

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.