Page 28 of the document you linked says that although Bushnell identified Lilly and used she/her pronouns on some suspected accounts. On other accounts, Bushnell identified as Aaron and was comfortable using he/him pronouns. It is possible that Bushnell was comfortable with both gender identities.

If Bushnell was Lilly, that doesn’t mean she wasn’t Aaron; she could have been both.
Very true. As discussed above, Bushnell may have had a sufficiently expansive gendered self-
concept that both the gender she expressed online and the gender she expressed offline were
fully integrated, fully embraced aspects of who she actually was. She might, for example, have
been bigender or pangender. I did not interpret C1’s remark that she was “gender fluid” as
referring to the specific gender identity, but she could indeed have been literally genderfluid
stricto sensu (insofar as any shared subjective experience can have a strict sense).

The document also says that Bushnell identified as Aaron in documents posted during the act of self immolation. The document also points out that there were entirely separate but both active internet accounts. The account 'acebush1' on reddit was active and used the name Aaron until the time of death. Last activity from acebush was February 24, death on February 25.

The document does not present the case that Bushnell was uncomfortable with using he/him pronouns or the name Aaron. I think it would be fair to say Bushnell used multiple gender expression.