LOL. Your friend sounds like he doesn't know very much. For starters, it took some genius architectural engineers to construct the tombs, domes, arches, and barrel vaults of the Achaemenid, Parthian and Sasanian Empires. From what I remember, their names have unfortunately not been preserved for posterity. However, many of their monuments in stone and brick still remain, albeit in ruins (and unfortunately ISIS has played a role in erasing that history by leveling the ruins of Hatra to the ground).
The earliest scholarship, outside of simple record-keeping, perhaps centered around the ancient
Avestas.
Zoroaster himself is traditionally credited with writing the
Gathas and
Yasna Haptanghaiti. Iranian mythology, especially the tales about Rostam, had a recorded long history before Ferdowsi ever compiled the
Shahnameh in the late 10th century. In fact, only small bits of that work are his original writings; the vast majority is collated material from earlier books. For instance, Ferdowsi relied heavily on the Sasanian-Persian universal history book
Khwaday-Namag, compiled during the reign of
Yazdegerd III (r. 632–651 AD) but perhaps existed as far back as the reign of Khosrau I, who was the greatest patron of native Persian scholarship before Islamic times.
Following the success of the 5th-century AD School of Nisibis under Persian control, in the 6th century AD,
Khosrau I (r. 531-579) established the Academy of Gondishapur. It was here the Greco-Roman literary, philosophical, medicinal, mathematical and scientific treatises were translated into Syriac and Pahlavi. They also built on the legacy of the ancient Babylonians of Mesopotamia, and invited scholars from India and China to study and translate at this school. It attracted prominent theologians such as
Rabban Hormizd and even the Nestorian Patriarch
Timothy I. It was also during the reign of Khosrau I that the Sasanian Persian physician
Borzuya was active. He was responsible for translating the Indian
Panchatantra from Sanskrit into Pahlavi, well before Ibn al-Muqaffa' translated it into Arabic in the 8th century.
There are obvious reasons why a lot of pre-Islamic Persian literature no longer exists. We know that much of it was destroyed when the library and archives of Persepolis were burned down by Alexander the Great's soldiers in the 4th century BC. After that, the overwhelming Hellenistic cultural influence over West Asia stifled a lot of native Persian motivation to continue traditional scholarship. This was revived by the Parthians to an extent, and saw a virtual renaissance under the Sasanians, but the Islamic caliphate that supplanted the Sasanian Empire perhaps actively destroyed a lot of literature deemed pagan and heretical. The evidence for that is that a lot of Zoroastrian texts only survived after being preserved in the distant exiled communities of Zoroastrians far from their Persian homeland, such as the Parni in India.
There's also this to consider: the Baghdad Battery, discovered near old Ctesiphon, a primitive battery dated to the Sasanian period:
https://en.wikipedia.org/wiki/Baghdad_Battery