LazyDFU 0.1.3 is listed for Minecraft 1.19 and 1.20.x, which includes the 1.20.1 use case. Compatibility, however, is not the same as necessity: the original project notes that Mojang significantly improved DFU initialization from 1.19.4 onward.
Compatibility vs usefulness
A mod can load correctly while delivering little measurable benefit. For Minecraft 1.20.1, test startup with and without LazyDFU and keep the simpler setup if the difference is negligible.
Why newer Minecraft changed the calculation
Mojang reduced the cost of DFU initialization in newer versions. LazyDFU’s original advantage came from avoiding expensive eager rule preparation, so reducing that base cost naturally reduces the potential gain.
Client and server considerations
The original project notes that server-side behavior changed earlier, while the client could still initialize rules. Evaluate where you actually see delay instead of installing the mod on every side by habit.
A practical decision rule
Use measured startup time, loader compatibility and modpack stability as your criteria. If the mod adds no visible benefit on 1.20.1, removing an unnecessary optimization component can make maintenance easier.
Related next step
Use the compatibility information above before choosing a download. If you only have the supplied master.zip, remember that it is source code rather than a normal mods-folder JAR.