pete evans dropped as a celebrity ambassador by food chain sumo salad .
the salad chain are denying this is related to his paleo controversies .
evans ' infant cookbook bubba yum yum : the paleo way was set for release on friday march 13 but was delayed due to health concerns .
it is co-authored with blogger charlotte carr and naturopath helen padarin .
the book is becoming a self-published digital book released this month .