This is not true at all. How can this be possible when it is written in the Scriptures that Jesus died only once? (Hebrews 7:27, 9:12, 9:25-28, 10:10-14). It also says that He offered himself as a “single” sacrifice for our sins (Hebrews 10:12). He died once and it was sufficient to atone for our sins at that time, even now and forever.
What we see in the mass is Christ’s death, represented, not replayed. The sacrifice of Calvary is only represented in a sacramental way, not in the same physical, bodily and bloody way as it was on Calvary. Yes, Christ is present (body and blood) at the mass, but He is not dying over again, no. His blood is only offered to the Father as it was offered on Calvary.
The same sacrifice as that of Calvary is being made, not in a physical way but in a liturgical way.