Can’t say i have considered sewer pipe lining. Terracotta pipe is over 60 years old. Seen many a yard dug up in this neighborhood for those pipes. Not worth saving.
I’ll let theboss negotiate and just bite the bullet.
Have the boss get a quote on re-sleeve to compare…Less invasive and seamless when done. So long as you have no low bellies, it would be the way I would push for in the long run!
Although it may cost a little more and you’ll have some landscaping to deal with, IMO that’s the best option, especially since it appears there are some bellies and mis-aligned pipes.