I believe you misread that

You misread that paragraph. The semi-colons are used to denote a list of separate items.

Thus, the paragraph should be read as such:

"An incredible fact in this case is that in the very same room in which defendants Jackson, Millin, and Genrich conducted their parent-teacher conference with A.P. and his family – and reiterated their policies banning student religious express in class assignments –
defendants displayed student drawings of
1) the Greek goddess Medusa;
2) a demonic figure with horns, scales, and protruding tongue;
3) several demonic masks;
4) AND a drawing of the Grim Reaper, holding a scythe," ADF said."