https://dodgerblue.com/mlb-lockout-rumors-players-association-rejected-automated-strike-zone-robot-umpires/2022/03/08/
While the financial side of the deal remains the largest hurdle to clear, the two sides also have potential rule changes to work out. They have already agreed to the universal designated hitter and a Draft lottery, while an expanded postseason looks likely.
MLB also asked the players to agree to a pitch clock, larger bases, restricting shifts and an automated strike zone. Pending other matters getting resolved, the union is said to be open to some of those changes for 2023.
However, the robotic strike zone was not among that, according to Evan Drellich of The Athletic.
The players agreed to it in three areas that MLB wanted — the pitch clock, larger bases, and restrictions on the defensive shift — but not for the implementation of an automated strike zone, which MLB also sought.
https://www.mlb.com/news/mlb-mlbpa-agree-to-cba
As part of the agreement, a Joint Competition Committee will be formed comprised of four active players, six members appointed by MLB and one umpire. Beginning in 2023, the committee will be tasked with adopting changes to playing rules such as a pitch clock, base size, defensive positioning and automatic ball/strike zone.