① As per tafsir, the verse was revealed to let Muslims know that you can be intimate with your spouse in any position, refuting the 'People of the Book' [Jews specifically] who were claiming that entering from the back would cause harm to the baby. Islam was correct.
② The 'farmland' (tilth) metaphor is just pointing out that it is through women that men have offspring, which is just a fact of life. From Tafsir Ibn Kathir: "Ibn `Abbas commented, "Meaning the place of pregnancy." There is nothing wrong with pointing this out. Women should not be ashamed of how they are created nor should anti-Islam critics try to shame them on their ability to bear children nor should they shame men who want to have multiple children.
③ If non-Muslims want to know how Islam truly says to treat women, then they should know that Allah (ﷻ) said وعاشروهن بالمعروف [And live with them in kindness] - Qur'an 4:19. If interested, I wrote this article "The Object Allegation" to demonstrate that it's the world that treats women like objects [machines], not Islam.
I hope this helps.