Yes GfS, lawyers write briefs to SCOTUS. For that purpose they are generally preferable to scientists.

"Energy may be a form of matter." has someone changed the definition of matter and not told me?

nope.

>>>
mat·ter
[mat-er] Show IPA
noun
1.
the substance or substances of which any physical object consists or is composed: the matter of which the earth is made.
2.
physical or corporeal substance in general, whether solid, liquid, or gaseous, especially as distinguished from incorporeal substance, as spirit or mind, or from qualities, actions, and the like.
3.
something that occupies space.
4.
a particular kind of substance: coloring matter.
5.
a situation, state, affair, or business: a trivial matter. <<<