From the EULA.txt [0]:
"""
...
DESCRIPTION OF OTHER RIGHTS AND LIMITATIONS
You may not reverse engineer, decompile, or disassemble the SOFTWARE PRODUCT, except and only to the extent that such activity is expressly permitted by applicable law notwithstanding this limitation.
...
COPYRIGHT
All title and copyrights in and to the SOFTWARE PRODUCT (including but not limited to any images, photographs, clipart, libraries, and examples incorporated into the SOFTWARE PRODUCT), the accompanying printed materials, and any copies of the SOFTWARE PRODUCT are owned by the Author of this Software. The SOFTWARE PRODUCT is protected by copyright laws and international treaty provisions. Therefore, you must treat the SOFTWARE PRODUCT like any other copyrighted material. The licensed users or licensed company can use all functions, example, templates, clipart, libraries and symbols in the SOFTWARE PRODUCT to create new diagrams and distribute the diagrams.
...
"""
At the bottom of the README:
"""
© Roadometry 2018
"""
Maybe I missed something but this seems pretty closed source to me.
"Source available" would be a more appropriate term for this project.
[0] https://github.com/asfarley/vtc_lfs/blob/master/EULA.txt
