No. There's no check for Cydia or other Debian Package frontends that are there to void your warranty or stop you from downloading cracked apps (they very well could do this). They only patch the security vulnerabilities that are actually used to break out of the app sandbox and run arbitrary code, something that, as we can see with Epic's Fortnite app, could be RCE'd into an app without Apple knowing. These vulnerabilities can and have been used by actual malware in the past[0], so Apple fixing them in iOS is a legitimate security measure.

0: https://blog.talosintelligence.com/2019/10/checkrain-click-f...