Remember that Russell believed that 1914 would be when God's kingdom would be established on Earth (ie, not the start of the end times, but the conclusion), and that 1874 is when Jesus ascended to the heavenly throne and began his invisible rule. He taught this for decades and expressed full confidence that God had revealed this to him.
If his confidence was misplaced and he was forced to modify his explanation (and quite drastically, at that), then there is no reason to accept modern explanations, no matter how confidently they are expressed.