He might, fear of the Soviet Union specifically was not the sole nor the most important factor in the rise of the NSDAP. I would argue it wasn't even an important factor at all. A bunch of local issues would have weighted a lot more, including but not limited to revanchist sentiments against the west, the dolchstoßlegende in which they specifically blamed Jews and Socialdemocrats, and perhaps most important of all, economic woes, etc.
For example in the mid-20s before the Great Depression, things were actually looking up for the German republic. The NSDAP seemed to have lost its chance at power forever, having obtained less than 3% of the vote in the 1928 elections. During this period, German-Soviet relations were actually pretty good, too.
And as I mentioned, the USPD-SPD split happened before the October Revolution, anyway. So there would still be communists in Germany in a scenario in which the Octber Revolution never happened. In fact, had the October Revolution never happened, the USPD/KDP might be stronger, and they did get more than 10% of the votes in the 1928 election.
The truth of the matter is that fascists and far-rightists have always used the supposed threat of trade-unionists, socialdemocrats, socialists, and communists to polarize and galvanize societies, which they then take advantage of to appeal to national pride, etc. That does not mean that these groups are to blame whenever through history a fascist regime has emerged, the fascists themselves are to blame, and perhaps the societies which made their ascent possible in the first place too.