Are these sentences OK?
What was said about him wasn't true. (in the past)
What was said about him isn't true. (today)
What has been said about him isn't true. (today)

Question

Are these sentences OK?
What was said about him wasn't true.  (in the past)
What was said about him isn't true. (today)
What has been said about him isn't true. (today)

Answer

They're grammatically correct.  It's also important to understand the differences between them.  The last one is the trickiest to distinguish; it implies either a longer or more recent time frame.

Answer

all good!