I just have received some feedback:
Thank you for providing your feedback to SecureKnowledge on sk65627, titled "How to Import / Export IPS Protection Profiles".
In the past R80 version was included in this sk, but it was removed on January 2018 after it was found that in R80 the imported profile is a partial version of the exported.
That simply means: No longer supported...
The confusing detail is that this command was was still present in Threat Prevention Administration Guides R80.00 to R80.30 p.41 until it was removed:
Checking the updated version of Threat Prevention Administration Guide R80.30 I can see in the Revison history that this section was removed:
12 May 2019 ips_import_export section removed.
CCSP - CCSE / CCTE / CTPS / CCME / CCSM Elite / SMB Specialist