According to MST those TDs are proactive and based on input from other teams, not just Ferrari in their forced cooperation with the FIA.
TD/018-20 is as stivala posted above about the new ERS sensor which will be used by all teams later on in the season, they also supposedly limited the frequency at which ERS power can be pulled from the system, preventing that sudden changes of the demanded power level could interfere with the proper function of the sensor(s).
TD/019-20 concerns the 0.3L/100km oil limit, contains details about it's enforcement, measurement etc, also supposedly something about stopping the teams from adding oil and/or using lubricants to transport chemicals into the fuel.
TD/020-20 contains information about the fuel flow, pressure and temperature sensors.
TD/021-20 is about how they'll enforce the rules about fuel usage and the methods used to do it or something like that ...