idnits question

[Robert Moskowitz <[e-mail]>]

I am helping a newbie with a new draft.  idnits has the following warning:

   == Couldn't figure out when the document was first submitted -- there may
      comments or warnings related to the use of a disclaimer for 
pre-RFC5378
      work that could not be issued because of this.  Please check the Legal
      Provisions document at https://trustee.ietf.org/license-info to 
determine
      if you need the pre-RFC5378 disclaimer.

I can't figure out why.  Perhaps it is related to these warnings can be 
ignored?

   -- Obsolete informational reference (is this intentional?): RFC 2246
      (Obsoleted by RFC 4346)

   -- Obsolete informational reference (is this intentional?): RFC 4346
      (Obsoleted by RFC 5246)

   -- Obsolete informational reference (is this intentional?): RFC 5246
      (Obsoleted by RFC 8446)

   -- Obsolete informational reference (is this intentional?): RFC 6347
      (Obsoleted by RFC 9147)

And yes, they need to reference these older RFCs.  Or, rather, I am not 
the one to debate this point.  I am just working with them to get their 
work out.

Thanks

Bob