This is poor design. Multi-tenant data model design must have a tenant or segment ID for every tenant segmented tables. While it may not be a problem initially

This is poor design. Multi-tenant data model design must have a tenant or segment ID for every tenant segmented tables. While it may not be a problem initially but as the business grows, you may need to move tenant data to separate DBs or even different regions based on compliance requirements. IMHO it is a good idea to run DB migrations and have a tenant ID populated in all tenant segmented tables