Even between relinquery and soup cage phylactery has been used/is still used to refer to amulets, protective charms. Admittedly the D&D phylactery is protecting what it contains rather than providing protection to what it’s attached to, but it’s a much clearer connection than the tefillin.
TIL, but Phylactery has other meanings too and I think the “D&D Lich soul container” one refers back to the reliquary meaning.
Given that it refers to something that contains a bit of a person, sure. But do you expect the dersh to be honest in his antisemitic accusations?
Even between relinquery and soup cage phylactery has been used/is still used to refer to amulets, protective charms. Admittedly the D&D phylactery is protecting what it contains rather than providing protection to what it’s attached to, but it’s a much clearer connection than the tefillin.