§ 530. Job security for track employees. Plans of operation of regional off-track betting corporations shall include provision for job security for employees of racetracks within each region compatible with and in furtherance of the objectives of this article and subject to the approval of the state racing and wagering board. Job security agreements that may be concluded from time to time after July first, nineteen hundred seventy-three between track employee organizations and the New York city off-track betting corporation or any other regional off-track betting corporation shall be subject to the approval of the board and when approved shall be deemed a part of the plan of operation of such corporation and any other regional corporation; provided, however, that nothing in this article or any other provision of this chapter shall be construed to require or empower the board to abrogate job security agreements between the New York city off-track betting corporation and any track employee organization, in effect on July first, nineteen hundred seventy-three and any such contracts shall be deemed to be a part of the plan of operation of such corporation.