Their so-called crontab isn't a real crontab, it's some web-application that is running things. All the nph-*.cgi scripts have code that detects whether it's being run from shell or the web and displays things accordingly. In your case, it's detecting that it is being run from the web, and thus the shell arguments you are passing it aren't being used. You might be able to get it to work if you pass in 'do=check_links;method=5' as the arguments to nph-verify.cgi instead of --check-all.

Adrian