Are you the registered keeper?
The rules are contained in S1c] Road Traffic Offenders Act 1988 which you’ll find here
They must either deliver a NIP verbally at scene or serve it upon the registered keeper within fourteen days of the offence. When it reaches the actual driver is a non issue. Under S1[1A] the notice should actually arrive within 14 days.
However even if they are late, its important to respond in a particular way. The document you have received is confusing. Although it is one document, it contains both a NIP and a S172 form which are two different legal entities. They may well be time barred on the NIP but that doesn’t mean you can avoid your S172 responsibilities. If you don’t respond naming the driver on the S172 form they will charge you with failing to identify. Probably they are hoping you will do exactly that so that they can prosecute you for something.
Can I clarify anything for you?
Yes, it does but it doesn't matter when the driver receives it.
Did that notice refer to a reminder document?
Usually they send out two NIPs. The first and then a reminder NIP. If this was reminder then they may be saying the original was in time.
It will have reminder on it.
No problem and all the best.
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If that is the first and that was out of time then that would give you a challenge to prosecution.