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I believe that the intent is to install short, open (no component) 50Ω components and THRU lines onto the board and use them as calibration standards.
Then build a circuit (filter, etc.) on the "sea of holes" and test it, using the standards to calibrate a VNA.

I suspect that, due to the fact that the board has a lot of parasitic capacitances and inductances, and that the components have not been accurately characterized, that its usefulness is likely limited to the HF and low VHF frequencies.
Best regards, Don Brant