A fuller instance of the first quote:
"Through careful and
thorough fault injection, we show that ZFS is robust to
a wide range of disk faults. We further demonstrate that
ZFS is less resilient to memory corruption, which can
lead to corrupt data being returned to applications or
system crashes"
...ie, ZFS is 'less resilient' in comparison to its robust disk fault handling, not that it's less resilient to memory corruption in comparison to other filesystems. The parent quotation above implies that ZFS is more sensitive to memory corruption than other fs but that is not claimed in the referenced paper.
"...We further demonstrate that ZFS is less resilient to memory corruption, which can lead to corrupt data being returned to applications or system crashes..." - https://research.cs.wisc.edu/wind/Publications/zfs-corruptio...
"Please Use ZFS With ECC Memory" - https://louwrentius.com/please-use-zfs-with-ecc-memory.html