Here’s a historical account from 1919, to show how long historians have been aware of the subject. This excerpt covers debate about black enlistment. Note the dates
"On November 7, 1864, W. G. Swan of Virginia introduced a resolution into the house setting forth the statement "That in the judgment of this House no emergency now exists or is likely to occur . . . which demands that negroes shall be placed in service as soldiers in the field."58 This resolution may have been drawn to forestall President Davis’ remarks in his annual message of the same date in which he suggested that negroes “might be employed as pioneer and engineer laborers” to the extent of 40,000 men59 and also to put the house on record as being opposed to any extensive military use of negroes as soldiers. The resolution was deferred to November 10 for consideration before the house.80 On November 8 Mr. H. S. Foote of Tennessee introduced a long resolution referring to the use of negroes, which among other matters, resolved that " the ‘general levy and arming of the slaves for the duty of soldiers’ would be inexpedient."91 On November 10, the day appointed for discussion of the resolutions (the meeting was a secret session) no record or detailed and definite statement of consideration of these resolutions is found in the journals of the confederate congress. On the same day, however, a resolution by H. C. Chambers of Mississippi, which had been introduced on November 7, was taken up in which it was stated that “our citizen soldiers . . . will continue a sufficient guaranty of … independence,” and the house “spent some time” considering it. The discussion was long and bitter, so long, in fact, that all the time of the session was consumed in discussing it and none was left in which to consider the resolutions offered by Swan and by Foote which were to come up in order of presentation after Chambers’ resolution had been disposed of.82
Referring particularly to the employment of negroes as soldiers Chambers said that he was “ashamed to debate the question. All nature cries out against it. The negro was ordained to slavery by the Almighty. Emancipation would be the destruction of our political and social system. God forbid that this Trojan horse should be introduced among us.” Goode of Virginia was opposed to the suggested use of the negroes because it was “a confession of weakness to the enemy”; because he thought “it would end in abolition”; and because it was "degrading to our men."68 "
This is in LATE 1864. This is the Confederate Congress, even though they are in desperate straits by this point, they don’t want to allow slaves to serve. There could not have been 94, 000 men enlisted before 1864, because as you can see, it was intensely opposed and at this late date–November 1864–was still forbidden. Here’s a link to the whole article:
“http://books.google.com/books?id=ssELAAAAIAAJ&pg=PA34&dq=“the+South+and+the+arming+of+the+slaves”&cd=1#v=onepage&q=“the%20South%20and%20the%20arming%20of%20the%20slaves”&f=false”