TLS record layer version is not present in client SSL profile. Please check the last part of the doc, where it mentions beginning v 12.1.0, TLS record layer version is used TLS1.0 unless db value is disabled.
Beginning in BIG-IP 11.5.4 HF2 for the BIG-IP 11.5.x branch and BIG-IP 12.1.0 HF1 and later, the ssl.outerrecordtls1_0 database variable is introduced. Prior to this database variable, the version present in the ClientHello and the version present in the outer record match. With the introduction of this database variable, which is enabled by default, the version present in the outer record is TLS 1.0, regardless of the version in the ClientHello. To verify the value of ssl.outerrecordtls1_0, perform the following procedure: