Sounds like Indy management is not interested in opening the tender for the new chassis outside of Dallara, and will roll out engine and hybrid first, then the new chassis at least a season later, likely a couple.
Looks like engine and hybrid 2023, and make it fit.
New chassis, with all they have learned from the new PU system needs, aeroscreen and side intrusion panels for 2024, but 2028 mentioned a few times in Jay's statements so maybe a couple years? That chassis design will be well worn in by then, introduced in what 2011/12? Got their moneys worth out of it
https://racer.com/2020/12/29/indycar...ssis-rollouts/