where did you get the cpu_load_arguments custom variable from? That’s not how command parameters work, see here.
Also the load check command comes pre-defined inside the ITL. You don’t need to redefine that on your own, just take the power of adding it and set the required custom variables in the service apply rule.
Also, please don’t post screenshots from the configuration, rather use Markdown formatting to allow others to copy paste. Typing things from a picture is not fun.
Even it is the old post, it could be useful information:
The check_load plugin doesn’t check CPU load but system load which is very different. System load is generally number according to the overall status of the system and needs to be interpreted with the past experience.