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In addition to the contributions as committer they participated at a community level, not just a technical one. In general, A contributor will be considered as project committer first. After the committer has shown contributions at the community level, the committer will be considered for PPMC membership. In the exception, that a nominee for committer has only shown technical contributions, but no active engagement with the broader developer or user community the PPMC might decide to delay consideration for PPMC membership. PPMC members should strive to identify nominee for PPMC membership outside of their own organization.
The Apache MXNet PPMC makes someone a PPMC member via nomination, discussion, and then Consensus Approval: i.e. at least 3 +1 votes and no vetoes. Any veto must be accompanied by reasoning and the vetoer must be prepared to defend it. Other PPMC member can attempt to encourage them to change their minds. The PPMC decides on an individual basis to have a single vote for committer and PPMC membership or to hold to separate votes.