Impressive laboratory work relativists would say. But Einestin did not
had any laboratory experience. His lab experience was only from
books and patent he read.

He hated measurements instruments. He did not even knew that data
from instruments are error bars prone. And he did not knew how to
eliminate the error introduced in data by these error bars.

He did not knew what EM was, but he knew that it was light.

This is impossible. First you need to know what this EM is, then you
may say that it is something else