You are confidently incorrect. Consent is not needed if you only track for your own business and do not send the data to other businesses. One of the big GDPR-compliant website analytics tools, matomo, even has a dedicated page on this topic: https://matomo.org/blog/2021/10/matomo-exempt-from-tracking-...

"Matomo has also been approved by the French Data Protection Authority (CNIL) as one of the select few web analytics tools that can be used to collect data without tracking consent."

more info: https://matomo.org/gdpr-analytics/