That's exactly what he said, and then he also said except for industry-specific software like video editing, graphic design, etc, where big companies don't offer a Linux version and the alternatives aren't quite up to par. It's true there's Offcie 365 online but it's still subpar compared to the real deal, like if you're a PowerPoint or Excel power user or really need Access or another specialized program.
I'm all for Linux, these big companies have just eaten a lot of the market and refuse to play nice.
Be aware that OnlyOffice is developed by Russians and headquartered in Latvia, it may be perfectly fine but it's worth being aware of. At least one company claims to have severed ties as a result, and supposedly you have to pay for full features? LibreOffice is completely FOSS. https://dms-solutions.co/blog/dms-solutions-stops-doing-business-with-onlyoffice-due-to-onlyoffice-close-ties-with-russia/