Yes, Its true.
What is true? That all the code is written by you? Definitely not.
I understand that you want to convert a Symfony bundle to Laravel and that's totally fine while the way you do it is not!
Since you added your "Thanks To"-notice (which btw is still not at all enough) after @codingdefined commented, it very much seems like you didn't really intend to make it transparent in the first place, that the most part of the code/docs is just copied. This can be considered as plagiarism and will result in your account being banned. Last but not least, the MIT license requires that you keep the original copyright notice. Removing the original author from all files, even though you made only minor adjustments, is unacceptable.
.....
Ok, got it. But still....
You removed ALL copyright notices.
https://github.com/bencagri/artisan-deployer/blob/master/LICENSE#L3
https://github.com/EasyCorp/easy-deploy-bundle/blob/master/src/Command/DeployCommand.php#L6
https://github.com/EasyCorp/easy-deploy-bundle/blob/master/src/Command/RollbackCommand.php#L6
https://github.com/EasyCorp/easy-deploy-bundle/blob/master/composer.json#L8
https://github.com/bencagri/artisan-deployer/blob/master/composer.json#L8
and so on and so forth...
Removing ALL references to the original author and making not a single note about the original repository (at least not before our moderator found the original) IS plagiarism. Intentionally or not, does not matter.
.......
I just posted examples and what GitHub or your IDE does automatically is irrelevant. It is still your responsibility to not violate license agreements. It's as simply as that.