PM 1 is the assumption, that you need to first convert into hypothesis, and then describe a Minimum Viable Product that addresses the PM 1 assumption.

Collectively the sequence of PM's (PM 1, PM 2, and PM 3 or however many of the top 5 Most Riskiest Assumptions were relating to the Product Market Fit) describe the MVP Roadmap. i.e. once you have positive tested your first hypothesis pertaining to PM 1, you would then create your second hypothesis relating to PM 2 and create your second version of the MVP, and then the third version of MVP based round the assumption in PM 3.