Claiming a home office which you do not use exclusively for business purposes as a business expense is tax fraud. If you have a fake "business" which you spend an hour a month on then this is only useful if you have an extra room in your house that you're fine with effectively just boarding up.
But claiming your home office (a part of your home explicitly used for work) as a business expense is definitely not tax fraud.
You can’t claim your kitchen tho.