Most of his blogs are about how awful OOXML (Microsoft Office's open standard) formats are, and that everyone needs to switch to ODF (his preferred open standard).
What people don't want to use is products which don't work with everyone else's. LibreOffice works with Microsoft Office files really well, but for some reason Italo doesn't want you to know that. He wants the entire world to switch formats to LibreOffice's formats, but really that's just telling potential business users LibreOffice can't meet their needs... interacting with the existing monopoly of Microsoft Office users.
This is a self-sabotaging marketing approach. LibreOffice needs to be promoting itself as an excellent drop-in replacement for Microsoft Office which will easily interoperate with every other organization's office applications, regardless of format.