Unless I missed something in the docs, you have to go through the old NestedObjects routine to do it.
Here’s a JScript version. Python to follow soon…

var n = Selection(0);

oEnum = new Enumerator( get_comments(n) ) ;
for (;!oEnum.atEnd();oEnum.moveNext() )
{
	var oComment = oEnum.item() ;
	LogMessage( oComment.Parameters("Text").Value );
}

//--------------------------------------
// Find comments
// Works with an ICENode or a compound
//--------------------------------------
function get_comments( node )
{
	var oComments = new ActiveXObject( "XSI.Collection" );
	if ( ClassName(node) == "ICENode" )
	{
		var oComment = node.NestedObjects("ICE Comment");
		if ( oComment != null ) oComments.Add( oComment );
	}
	else if ( ClassName(node) == "ICECompoundNode" )
	{
		var nested = Dictionary.GetObject( node.FullName + ".ContainedNodes" ).NestedObjects;
		oEnum = new Enumerator( nested ) ;
		for (;!oEnum.atEnd();oEnum.moveNext() )
		{
			var oItem = oEnum.item() ;
			if ( oItem.Type == "ICETreeComment" )
			{
				oComments.Add( oItem );
			}
		}
		
	}
	return oComments;
}

from siutils import si		# Application
from siutils import sidict	# Dictionary
from siutils import sisel	# Selection
from siutils import log		# LogMessage
from siutils import disp	# win32com.client.Dispatch
from siutils import C		# win32com.client.constants

def get_comments( node ):
	oComments = disp( "XSI.Collection" )
	
	if si.ClassName(node) == "ICENode":
		oComment = node.NestedObjects("ICE Comment")
		if ( oComment != None ):
			oComments.Add( oComment );

	elif si.ClassName(node) == "ICECompoundNode":
		nested = sidict.GetObject( node.FullName + ".ContainedNodes" ).NestedObjects
		for o in nested:
			if o.Type == "ICETreeComment":
				oComments.Add( o )

	return oComments
	
	
n = sisel(0)

# Get comments and print out the text
for c in get_comments(n):
	log( c.Parameters("Text").Value )