Phase I is a test of the airplane. Likely 40 hours for that airplane. Sounds like it was probably done but if no records the FAA may consider it never happened despite how obvious from the condition of the airplane.

In a typical phase I it is NOT a time for flight instruction. It sounds like that may be what you are after. Also, historically, phase I was required crew only. Meaning just the pilot. Newer regulation allow a passenger who meets certain very stringent requirements.

Given the newer regs and since this may not be a typical phase I it may be that you can get some instruction during that time although it is not the intent of phase I to get primary flight instruction.

If you want insurance you should check that as well. Many do not allow student pilots in any experimental much less a student during phase I.