You might PM him and ask. It may be because his content is old he doesn't feel like updating it to the"latest/greatest".
I don't know how many locos he created but I have these heavy SG locos of his in TS2010:
SE-NKP #757 Lima Berkshire 2-8-4 V3 Loco,<kuid2:387564:300801:1>
SE-NKP #858 Lima Texas 2-10-4 Loco,<kuid:387564:300811>
SE-NKP #765 Lima Berkshire 2-8-4 V2 Loco,<kuid2:387564:300821:1>
SE-C&O #1309 USRA Mallet 2-6-6-2 Loco,<kuid:387564:300871>
SE-T&P #610 Lima Texas 2-10-4 Weathered Loco,<kuid:387564:320021>
SE-T&P #610S Lima Texas 2-10-4 Weathered Loco,<kuid:387564:320027>
SE-T&P #638 Lima Texas 2-10-4 Weathered Loco,<kuid:387564:320029>
SE-T&P #615 Lima Texas 2-10-4 Loco,<kuid:387564:320051>
SE-T&P #616 Lima Texas 2-10-4 Loco,<kuid:387564:320057>
SE-T&P #623 Lima Texas 2-10-4 Loco,<kuid:387564:320059>