Yes, Elmer Fudd and Yosemite Sam can lose their original weapons.  If you were wondering about their guns and copyright law, after some circuitous research on the web, aka, The 10^th Circle… I have found that the decision was made by Warner Brothers and not some sort of an end-run by HBO.

Also of interest, I found, according to Fandom, “ All cartoons released in 1934 are under copyright, all post-1943 shorts are under copyright, while all cartoons released in 1930 and 1931 are in the public domain.:.[1]  However, just looking at the instance of Yosemite Sam, according to Wikipedia[2], he did not appear until 1944. If both of these statements are true, Sam is under copyright owned by Looney Tunes and Merrie Melodies which is owned by Warner Brothers (2). Disney and Warner Brothers are not connected and in fact, have been rival companies in the cartoon space since the 1930s.[3]

It’s an unfortunate turn of events but part and parcel of the re-imagining of American history that has been

[1] https://looneytunes.fandom.com/wiki/List_of_cartoons_that_are_currently_in_the_public_domain_in_the_United_States#:~:text=Many%20Warner%20Bros.,are%20in%20the%20public%20domain.

[2] https://en.wikipedia.org/wiki/Yosemite_Sam

[3] https://indianexpress.com/article/entertainment/hollywood/disney-vs-warner-bros-a-battle-for-the-ages-3 5034701/#:~:text=The%20rivalry%20between%20Disney%20and%20Warner%20Bros%20dates%20back%20to%201920s.&text=Warner%20Bros%20and%20Disney%20own,Marvel%20has%20taken%20a%20lead.&text=The%20reason%20was%20Looney%20Tunes%20characters.