Tense Stomach Muscles After Lipo?

I suggest you see your surgeon again to discuss this issue. It is unusual and may resolve with time, but it's better to see your surgeon just in case.

Muscle spasms can occur after any type of trauma, whether injury or surgery.  An examination will help determine if this is muscle spasm or the tightness of your abdominal muscles. Raffy Karamanoukian, Los Angeles

Localized edema from your liposuction affects surrounding structures like nearby muscles. Prolonged edema is likely following a repeat surgery and when prolonged and localized is called "induration". Fine scar adhesions may also result in the feeling you describe. The good news is that this almost always resolves. Massage, exercise and "tincture of time" usually helps.

     This tightness is probably the result of scar formation after the second liposuction.  The more liposuction procedures you undergo the more scar that accumulates.  The scar should soften considerably after the first 3 months and should continue to improve for at least the first year.  Massage can improve this sensation and can help break up adhesions and tighter scar formations.

It is unusual for this to persist for so many months.Ask your surgeon to consider a referral for evaluation by a physical therapist. In my experience they seem to have the most experience in dealing with and resolving  these sorts of issues. All the best.