The issue isn't 2013-2019 for the first Fateh since it was Iran's first experience with a 500-600 ton sub, the issue is no further Fatehs since 2019-2023 (this is assuming work on Fateh #2 only started after Fateh #1 was commissioned).
At this rate the 4th Fateh (the only one with AIP) will join Iran's navy in 2040. Iran is better off buying subs from Russia than wasting all this time.
You are preaching to choir. I’m a long critic of Iranian shipbuilding times. They are abysmal.
I will say larger subs typically take a decent amount of time to build 4-5 years isn’t unheard of. For a 500ton sub it should be built within 3 years ideally.
The only shipyard pumping ships out extremely fast is China. But China also a military budget of $120B+ compared to Iran’s paltry $15-20B.