Does a temporary lease on a home purchase allow for alterations?

According to the Texas Association of Realtors a buyer who moves onto a property before closing  is a tenant. The tenant must obtain in writing a consent from the owner, now the landlord, to make any changes to the property such as the following: 

• Alterations 
• Making holes in walls 
• Painting 
• Decorating 
• Installing improvements 
• Adding fixtures 

Basically the tenant should move in and CHILL out until closing.  If the seller does consent to any alterations and the house does not close escrow , then the tenant has spent money on a home he does not own!