Deleting a multivariant has removed the child product itself, but not the variant from the Parent product. Also, now it is impossible to save any changes to the parent product:
vmError: VmTable #__virtuemart_products_el_gr Check not passed. Neither slug nor obligatory value at product_name for auto slug creation is given 1087
vmError: You are not an administrator or the correct vendor, storing of product cancelled
In the attachment you can see the "ghost" of the variant. I cannot find this anywhere in the database to try and remove it manually. I have cleaned website & browser cache multiple times but without any success.