If someone has blocked you on their iPhone, you won't see their contact photo, status updates, or any changes they make to their profile, including a poster if they're using it in iMessage. The blocking feature restricts these visibility options to maintain the block's privacy.
Regarding cached data, it's possible that your phone could retain some cached information even when in airplane mode or without an active data connection. Sometimes, phones store contact information and associated media locally, which could explain why you might see the contact photo and poster again even without an internet connection. This cached data might persist until you clear the cache or reset certain settings.
However, the behavior of cached data can vary between different phone models and operating system versions. If you're concerned about privacy or unwanted data appearing, you might consider checking your phone's settings to clear cache or reset specific data related to contacts and messaging apps.