Is the National Insurance forecast on the Government website always accurate? See below

Maybe a stupid question but has anyone had any indication that the info given re NI contributions/forecast is ever not 100% correct?

Mine shows that I've made enough years contribution to get the maximum payout (obviously with the caveat that the rules could change in the future), and maybe I'm being overly cautious, but I know I was contracted out for a couple of years so assume that's automatically taken into account?

I'm currently not working out of choice and living off my own means, just wanted to check that I'm not missing a trick by making voluntary NI payments if I don't need to.