I believe it's for real existing.
This is a prepared statement from which the Senate will then derive questions to ask Browder, which he will answer under oath, i.e. under penalty of perjury if he is found to be knowingly misleading in his testimony.
jonnyfive, am I correct in assuming that the content of a prepared statement is legally equivalent to any testimony under oath?
Unless I'm wrong (and please correct me), Trump (Sr.) has gone under oath exactly once since announcing his presidential campaign: during the POTUS inaugural ceremony. Not a very exhaustive line of questioning, there.