It may be an attainder depending on how it’s done.
Why not just ban using ‘fetal tissue’ from government funded abortions? There’s plenty of un-government funded ones to supply that industry.
How can defunding a government-dependent program be construed as “attainder” in any way, shape or form?
Attainder is the government declaring someone of being guilty of a crime without trial and acting to summarily punish said someone.
It is a pant load of nonsense. There is nothing that is funded by the government that can not be unfunded by the government. The legislature holds the purse strings in all events.