The example you shared belongs to a third party demonstrating the example using MATLAB R2021a. Even in that, I don't think there's something called realtime.tlc System Target File. What I found in the documentation is that you can select grt.tlc, as demonstrated by several examples in the Simulink Compiler Documentation. Refer to this:https://www.mathworks.com/help/slcompiler/gs/export-model-to-standalone-fmu-with-source-code.html
Also, I browsed through the MATLAB-provided TLCs available at https://www.mathworks.com/help/rtw/ug/compare-system-target-file-support.html grt.tlc should help you reproduce that example without any issues.
If you need to use a custom TLC file, you might want to consult the Typhoon HIL Software Manual or related sections where this specific TLC file is discussed.
However, if a custom TLC file is not available, using grt.tlc should suffice for your needs.
