This is historical revisionism, plain and simple. In Mech's book, it clearly explains that "[t]he original alpha animals in a pack would be the mated pair that produced the young of which the pack is composed." L. David Mech,
The Wolf: The Ecology and Behavior of an Endangered Species 69 (2003 ed. Univ. Minn. Press).
"Alpha" has not implied harsh dominance through cruelty for at least the past couple of decades, if it ever did.
Indeed, Mech's book even notes the alpha taking the pack's fears and desires into account. "If wolf government is strictly autocratic, one would expect to see pack members always following the leader blindly.... Strict autocracy is ruled out by an observation that I made on Isle Royale.... The island's pack of sixteen wolves was headed across the ice of Lake Superior from Isle Royale toward the mainland, some twenty miles away. The wolves had gotten about one and one half miles from the northeast tip of the island when dissension among them became evident. Although most of the wolves appeared unwilling to continue, the leader seemed determined. Several times he returned to the hesitant pack and apparently tried to urge the members on. They continued for another half mile or so until they came to a section of rough and jagged ice. After testing this, the pack returned to Isle Royale. I had the distinct impression that it was the hesitancy of most of the pack members that stimulated the leader to turn back." Id. at 75-76. The current criticism of the term "alpha" is a straw man that mischaracterizes the original work's claims about pack leadership. "Alpha" in Mech's book isn't about unbridled "fighting" or "aggression," it's about kin relationships and social capital and taking care of the pack. The current view is not meaningfully different from the view in the book.
I suspect, though have no evidence, that this revisionism is due to political pressure over perceived "toxic masculinity" adopting "alpha" as a trope. If so, it is extremely distasteful, even dangerous; reinforcing the idea that science should bend to politics is authoritarian, naive, and threatens the survival of any nation where such is done.