You are not calling your anonymous subs as methods, thus they don't get any invocant ($self). You could call them like this:
my $method = $a->answers->{answers_comments};
$a->answers->$method(
123,
134,
145,
{
order => "desc",
sort => "votes",
},
);
Then they'll have an invocant.
It would be much saner though to install your methods as genuine methods, not coderefs floating around attached to blessed objects.
# in Answers.pm
use Sub::Name 'subname';
*answers_comments = subname(
"Net::StackExchange::V2::Answer::answers_comments",
one_param("answers","comments"),
);
Now you can call it like a proper method:
$a->answers->answers_comments(
123,
134,
145,
{
order => "desc",
sort => "votes",
},
);
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'
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