Do non-ACM events/conferences publish & index their final proceedings in the ACM digital library?
Yes, but there are rules.

There are three ways for conferences to have their proceedings published in the ACM Digital Library.

What most people mean by an "ACM conference" is a conference that is sponsored by ACM or one of its special interest groups.  Proceedings of all ACM-sponsored conferences are published in the ACM Digital Library.  ACM sponsorship must be advertised in all conference publicity, including the conference web site and call for papers.

Conferences can also be held in cooperation with ACM.  In-cooperation conferences can apply for their proceedings to be published in the Digital Library, but not all such applications are approved.  Cooperation with ACM must be advertised in all conference publicity, including the conference web site and call for papers.  In particular, in-cooperation conferences cannot claim to be sponsored by ACM.

Conferences can also apply to publish their proceedings in ACM’s International Conference Proceedings Series without sponsorship or cooperation.  These conferences are allowed to use a special ACM-ICPS logo on publicity materials to advertise the publication agreement, but they cannot claim to be sponsored by or held in cooperation with ACM.  This is the agreement advertised by ICCBDC.

Nothing on the ICBDR web site suggests that their proceedings will be published in the ACM Digital Library, so they almost certainly won't be.

(Indexing is a separate question.  A very small number of proceedings series like VLDB are indexed in the Digital Library even though they are not published by ACM.)