An individual participating in the Proportionate Retirement Program under Tex. Gov't Code Chapter 803 who did not establish and maintain ERS membership prior to September 1, 2022, may purchase previously established service credit in an amount equal to withdrawn member contributions but only for the purpose of establishing service credit and making a deposit under Tex. Gov't Code Chapter 820. The system shall receive an employer matching contribution for any individual purchasing previously established service credit under this section.