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Hi @zand2019sh,
Order Notes are an essential feature. For example, your payment gateway records transaction success or failure for an order in the order notes, and it also serves as a sort of audit log for actions. It cannot be disabled.
Removing those is a terrible idea that will prove costly if you ever need to have someone help you figure out why something isn’t working in the way that it should.
If you insist on removing this information with all the inherent risks, using a plugin like the one you’ve linked above would be your best bet. The alternative would be to access the database directly or write SQL queries to remove the information.