Link Whisper does use WP Cron in two of its systems. The first use is in the Error Report. In this case, it’s used to look for broken links and for double-checking the results to prevent false positives.
Since it’s possible to get false positives when scanning, Link Whisper does a double-check of the links in the Error Report. We use the cron task to slowly check all the links to rule out temporary errors. Some sites also have rate limiting rules that block page requests if too many are made in a short time. So slowly rechecking the results can remove false positives.
You can disable the WP Cron task used in the Error Report from the settings. (You will still be able to activate the Error report’s scan by clicking on the “Scan for Broken Links” button.)
The other place that Link Whisper uses WP Cron is in the Target Keywords system. In this case, WP Cron is used to slowly update the Google Search Console keyword data. This updating process is only active when GSC has been authorized and the process can be disabled from the settings.