There are no syntax errors in the code, that's all I can say.
Try commenting out all code except this one:
fd.spRendered(function() {
if(fd.field('Is_x0020_the_x0020_employee_x0020').value == 'No'
&& fd.field('Is_x0020_the_x0020_Employee_x002').value == 'No'){
//display the alert box
alert("You can't edit this form");
var listId = fd.spFormCtx.ListAttributes.Id;
var itemId = fd.itemId;
//redirect to Display form
window.location.href = _spPageContextInfo.webAbsoluteUrl + "/_layouts/15/listform.aspx?PageType=4&ListId=" + listId + "&ID=" + itemId;
}
});
You can also debug the code, find the instructions here: