The straight answer is: If you're not signed in and used Google on your phone, Google can retain data (like your IP address and device info) for up to 2 years, but the most likely retention period is around 6 months for anonymized data. Is this true

Yes, that's generally accurate. If you're not signed into a Google account, Google may collect and retain certain data such as IP addresses and device information. While specific retention policies can vary, Google often retains data for a period that can extend up to 2 years for certain kinds of raw data. However, when the data is anonymized, it tends to be retained for a shorter period, often around 6 months. It's always best to refer to Google's privacy policy for the most current and detailed information regarding data retention practices.