No, there are two things to point out:
1. After Einstein, the possessive case noun should be used, instead of Einsteins, this would be written as Einstein's. If the name ended in 's' it could be added aswell either with apostrophe + s or just the apostrophe, example Chris would become Chris's or just Chris'.
2. The verb to be is not correctly conjugated, since theories is plural the correct form would be 'were' instead of was.
A correct version of the sentence would be "The general consensus was that Einstein's theories were correct."
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