RC costs do not depend on compute time

In the recent steemitblog post it was stated:

The RC system uses three measurements to determine how much an operation should cost in terms of RCs: blockchain size, compute time, and state size.

Let's check the source code, if this is true:
The RC costs are determined by (code):

tx_info.usage.resource_count[i]

where i is one of

enum rc_resource_types
{
   resource_history_bytes,
   resource_new_accounts,
   resource_market_bytes,
   resource_state_bytes,
   resource_execution_time
};

resource_count is set in the count_resources in resource_count.cpp:

void count_resources(
   const signed_transaction& tx,
   count_resources_result& result )
{
   static const state_object_size_info size_info;
   static const operation_exec_info exec_info;
   const int64_t tx_size = int64_t( fc::raw::pack_size( tx ) );
   count_operation_visitor vtor( size_info, exec_info );

   result.resource_count[ resource_history_bytes ] += tx_size;

   for( const operation& op : tx.operations )
   {
      op.visit( vtor );
   }

   result.resource_count[ resource_new_accounts ] += vtor.new_account_op_count;

   if( vtor.market_op_count > 0 )
      result.resource_count[ resource_market_bytes ] += tx_size;

   result.resource_count[ resource_state_bytes ] +=
        size_info.transaction_object_base_size
      + size_info.transaction_object_byte_size * tx_size
      + vtor.state_bytes_count;
}

Wait, there is no resource_execution_time! A search showed that resource_execution_time is not set elsewhere. Something like:

result.resource_count[ resource_execution_time ] += vtor.execution_time_count ;

is missing in count_resources().

Conclusion

The statement in the post should be corrected to (when I'm right):

The RC system uses right now two measurements to determine how much an operation should cost in terms of RCs: blockchain size, and state size. In the next update, we plan to use also compute time to determine the RC costs.

I filled an issue about this: https://github.com/steemit/steem/issues/2972

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Although I'm familiar with c++, I do not know the entire source code of steem. I could be wrong.