QtSvg.framework is included by macdeployqt and as you said ..
cd PlugIns/iconengines/
otool -L libqsvgicon.dylib
libqsvgicon.dylib:
libqsvgicon.dylib (compatibility version 0.0.0, current version 0.0.0)
@rpath/QtSvg.framework/Versions/5/QtSvg (compatibility version 5.12.0, current version 5.12.9)
...
It is pulled in via the Qt Plugins/iconengines/libqsvgicon.dylib
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