The Corpus of Contemporary American English has three records for scheduled to a, but none is an alternative to scheduled for a, of which there are 157 records. The corresponding figures in the (smaller) British National Corpus are one and eight. However, the one instance of scheduled to a is
When the order is made it is scheduled to a confirmation Bill and
introduced into parliament.
It is taken from the Journal of the Law Society of Scotland. Given the similarity between this and your example, it looks as if there may be a specialised use of scheduled to a, which is not found more widely.
I have now looked at the source, and have to admit that scheduled to a confirmation hearing seems to be a straightforward solecism. Scheduled to a confirmation Bill in the Journal of the Law Society of Scotland must be a highly specialised legal use. In addition to the corpus evidence, all 56 citations including scheduled to in the Oxford English Dictionary are followed by a verb phrase.
The OED’s entry for the verb schedule provides this as its second definition:
To affix as a schedule (to an Act of Parliament)
and there is this 1885 citation in support:
A certain number of these are scheduled to the Act.
This is clearly the use made by the Journal of the Law Society of Scotland. It is equally clearly not the use made by writer of the OP’s quotation.