Etsy is being a dickhead with its non standard scope implementation. What a dick move

CustomEtsy.php

<?php

use OAuth\OAuth1\Service\Etsy;
use OAuth\OAuth1\Signature\SignatureInterface;
use OAuth\Common\Consumer\CredentialsInterface;
use OAuth\Common\Http\Uri\UriInterface;
use OAuth\Common\Storage\TokenStorageInterface;
use OAuth\Common\Http\Client\ClientInterface;

class CustomEtsy extends Etsy
{
    protected $scopes;
    
    public function __construct(
        CredentialsInterface $credentials,
        ClientInterface $httpClient,
        TokenStorageInterface $storage,
        SignatureInterface $signature,
        UriInterface $baseApiUri = null,
        array $scopes = array()
    ) {
        parent::__construct($credentials, $httpClient, $storage, $signature, $baseApiUri);

        if (null === $baseApiUri) {
            $this->baseApiUri = new Uri('http://openapi.etsy.com/v2/');
        }
        
        $this->scopes = $scopes;
    }

    /**
     * {@inheritdoc}
     */
    public function getRequestTokenEndpoint()
    {
        $scopes = '';
        if ($this->scopes) {
            $scopes = '?' . implode('&', $this->scopes);
        }
        return new Uri($this->baseApiUri . 'oauth/request_token' . $scopes);
    }
}

Is this an implementation of the Lusitanian/PHPoAuthLib ?