On one hand, yes; on the other - a human that can produce that level of details in the output would notice that iat & exp are extremely close & the token is ver

On one hand, yes; on the other - a human that can produce that level of details in the output would notice that iat & exp are extremely close & the token is very unlikely to be valid. Also, you don't produce an exact number for "now" without being able to compare it correctly with iat & exp (the timestamp it stated as "now" is actually less than iat!)