You have some non-orthodox opinions. When mentioning IaaS, it is ok to to only talk about Azure and AWS. Yes GCP exists but it is a distant 3rd. There are use cases where GCP is superior but there is a reason why they are pushing containers and talk about enabling multicloud where AWS and Azure don't.
When talking about SNOW, I think you are talking about Snowflake? If so, totally agree that they are a company to watch and enable a lot of backend services through data warehousing, but would not call them a service platform.
Saying Splunk is big data and not DevOps is a weird statement. It's not either/or. Splunk has security in it's DNA but is a major player in AIOps, with goal of zero-touch IT Management.
And finally, dissing the author for calling Workday, Adobe, and SFDC for calling them application vendors just seems, well, odd. That is that they are. They sell applications. Every research house on the planet will call them application vendors.
I am not saying you are wrong on any of these things as terms certainly get stretched by vendors, users, and research firms, but you are the one on edge of industry thinking in this case.