$ cat /tmp/alias.rb
class Foo
  attr_reader :root_foo

  def initialize(name: 'bar')
    @root_foo = 'foo'
    alias :"root_#{name}" :root_foo
    alias :"root_#{name}_2" :root_foo
  end
end

foo = Foo.new
p foo.root_foo
p foo.root_bar

$ ruby /tmp/alias.rb
"foo"
"foo"

$ bundle exec rubocop -x --only Style/Alias /tmp/alias.rb
Offenses:

/tmp/alias.rb:7:5: C: [Corrected] Style/Alias: Use alias_method instead of alias.
    alias :"root_#{name}" :root_foo
    ^^^^^
/tmp/alias.rb:8:5: C: [Corrected] Style/Alias: Use alias_method instead of alias.
    alias :"root_#{name}_2" :root_foo
    ^^^^^

1 file inspected, 2 offenses detected, 2 offenses corrected

$ cat /tmp/alias.rb
class Foo
  attr_reader :root_foo

  def initialize(name: 'bar')
    @root_foo = 'foo'
    alias_method :"root_#{name}", :root_foo
    alias_method :"root_#{name}_2", :root_foo
  end
end

foo = Foo.new
p foo.root_foo
p foo.root_bar

$ ruby /tmp/alias.rb
/tmp/alias.rb:7:in `initialize': undefined method `alias_method' for an instance of Foo (NoMethodError)

    alias_method :"root_#{name}", :root_foo
    ^^^^^^^^^^^^
        from /tmp/alias.rb:12:in `new'
        from /tmp/alias.rb:12:in `<main>'

$ bundle exec rubocop -V
1.65.1 (using Parser 3.3.4.2, rubocop-ast 1.32.0, running on ruby 3.3.4) [arm64-darwin23]
  - rubocop-performance 1.21.1