Oh yeah, it's totally a radical Marxist–Leninist thing and not at all something obvious advocated for now by the UN (voted against or abstained from near-exclusively by its minority of perpetrators) and human rights organizations like Human Rights Watch:

6. Who should receive reparations?

In the US, all Black people who are descended from people subjected to enslavement and who inevitably suffer its present-day legacies should be eligible for reparations.

Black people in the US are due reparations as worthy recipients of redress, justice, and reconciliation for atrocities and human rights violations experienced during and since chattel slavery. Although the slave economy built vast generational wealth for whites and propelled the US into global economic leadership, the US government has never adequately accounted for these wrongs, which continue to impact Black people via structural racism and pervasive racial inequality today.

While this text is focused on the idea of reparations for Black people in the US, it bears noting that Indigenous communities have faced centuries of displacement, violence, and cultural erasure due to colonization and US policies. The case for reparations is essential here as well—and appropriate reparations in that context might take a very different form.

The conversation around reparations is ongoing and involves not only consideration of historical injustices, but also current disparities and the potential for reconciliation and healing within society.

If the tankies want to support reparations, then fucking good for them.