That might be a sin of dishonesty though so.
Well, reportedly the Vatican during WW2 created fake baptismal certificates for Jews to help them escape the labor camps, etc. I think there's some dispute from moral theologians about what constitutes a sin in terms of lying. We had a thread about the subject here.
Given that their demand for us to be ναccιnαted is an unjust law/regulation/order/demand, do they have a right to know whether we're ναccιnαted? I hold that they don't. Could the ναccιnє card be presented by way of mental reservation? I think so. It is what it is. I got a copy of this form and filled it out, and now I am showing it to you. I am not making any formal representation thereby that I am actually ναccιnαted. I am just showing you a paper that I filled out myself. Lying is wrong because it's a misrepresentation of reality. What is the reality of the vax card? It is what it is. It exists. But if they want to interpret it as a proof of vaccination whereas it's just my filling out a copy of something I found online, then that's their problem. Consequently, I do not consider this to be lying.
If they were to ask me, "Are you ναccιnαted?" I could respond, "Yes, I am." ... since I received a couple of those childhood vaxes. If they ask, "Are you ναccιnαted against CÖVÌD-19?" I could respond, "Technically it's not a ναccιnє by definition." Some moral theologians believe you can say something like "Yes, I am ναccιnαted against CÖVÌD-19" [with the mental reservation of "as far as you're concerned"]. I hold that to be a bit of a stretch, but it's not an untenable position. There's the question of whether you have a right to that information. If you're looking for a family member of mine to kill them, I could say they are not in the house even if they are because as far as YOU are concerned, that is the truth, since you have no right to know otherwise.