My grandparents were stripped of all land as well and I am 100% certain it was not because of ethnicity since they were of the same as the ruling ethnic majority.
What you are explaining is probably local authorities - humans hated your relatives because of their ethnicity and that was one of the reason they got sent to Siberia. Taking land though was widespread in USSR. It was taken from ethnic Russians as well.
The fact that minorities survived and thrived on the same scale as Russians and got sent and taken land from on the same scale as Russians and got sent to Siberia on the same scale as Russians is a proof that there was no policy to destroy particular minority on a state level. It was a policy to destroy enemies of the state.
It is a matter of historical record beyond dispute that certain ethnic groups (e.g. Ukrainians, Poles, Germans, Balts, Tatars, Cossacks, Chechen and Ingush, in particular) were murdered, deported and suffered otherwise disproportionately during Stalin's reign.
You can argue whether this was motivated out of some pure "hatred" or not -- but if so, you'd be splitting hairs.
It doesn't matter what the official stance was, what matters what happened. My own relatives were sent to Siberia for being ethnic minorities, despite that they fought for the reds with the russian troupes in the finnish civil war. You can make excuses as much as you like that it wasn't because of ethnicity but reality was that ideology didn't matter back then. People are hateful by nature, especially to foreign cultures, taking away the lands that feeds your children and sending all men in your family to Siberian death camp doesn't sound like preserving any minority culture to me.