I’m not sure if I understand your question, but is is a fact that Tgr added separate “indefinite” duration to the offered drop-down list on huwiki in 2008. <https://hu.wikipedia.org/w/index.php?title=MediaWiki:Ipboptions&diff=prev&oldid=4056509> Whether you consider good or bad, you can discuss that on huwiki, since it is huwiki’s local customization; MediaWiki contains only “indefinite” in the default list, <https://translatewiki.net/wiki/MediaWiki:Ipboptions> with “végtelen” in the current built-in Hungarian translation. <https://translatewiki.net/wiki/MediaWiki:Ipboptions/hu>

While I understand the user doing the blocking might be able to distinguish two different _intentions_ (blocking “indefinitely” and “forever”), these can be explained in the blocking reason. And as a matter of fact, no block in MediaWiki is truly “infinite/forever”, you can always unblock the user anytime later. Which is what is meant by “indefinite”.

And if I am not mistaken, offering both options in the dropdown list does not make much sense because it does not work anyway: the dropdown list is just a suggestion, a shortcut; but you are able to choose _any_ expiration date, and it does not matter if/what you chose in the dropdown, only the result. Which means whether you chose “végtelen” or “határozatlan”, the end result is the same: the block is “indefinite”, and is shown as “végtelen” in the block list, because that is the way in(de)finite blocks are presented. <https://translatewiki.net/wiki/MediaWiki:Infiniteblock/hu> (Yep, right, in English texts, “indefinite” and “infinite” seem to be randomly mixed in the different messages.)

HTH,