This is an actual brainlet understanding of the concept of identity and consciousness.
You're saying her love is artificial, but both Shaltear and Albedo are equally artificial.
Not only do they come from a game as NPCs, but they were both written a specific way by conscious beings.
Neither of them were purely the results of nature and nurture in the typical sense.
The fact that Shaltears prescribed nature less specifically tells her to love Ainz does not somehow make it more valid, like her traits being by chance likely to make her love someone makes it any more valid than Albedo's traits doing the same thing more directly.
Love as a concept can be broken down to as brutishly practical as you want, you could say it's just reactions in the brain and you'd be right but that doesn't mean love still isn't love and equally spiritual.
If you were told you don't really like cocks up your ass and that you were just written that way, you may feel abused but at the end of the day you still love cocks up your ass the exact same, there is no inherent value upon coming to conclusions by chance rather than intervention, it's only that we as humans desire control over our universe that we find the concept of determinism insulting to our spirituality.
Not religious spirituality but our concept of our identity and souls, the short-hand for where we see ourselves as part of the universe.
We think therefore we are but if we can't insist on what we are what's the point in thinking?
To say Albedo's love isn't real is to say none of the personalities of the NPCs are real, all of them were written specific ways and play out what they perceive as free will according to those pre-fabricated bios.
To conclude; Shaltear is for crayon-eaters and Aura is best girl.