Nigel Farage's weird claims about Scotland

Nigel Farage has made the curious claim that the SNP cannot hold the balance of power after the next election on the grounds that the SNP will only take votes off Labour, and thus what will happen is a swap of leftist seats from one party to the other.

This headbanging thesis ignores the fact that the Liberal-Democrats have eleven seats in Scotland, and at least nine of them are under threat from the SNP. In fact, such are the majorities in Labour's West Coast strongholds, that it is quite likely that the bulk of them will remain Labour after May, so put together those two factors combine to make Farage's point risible.

Is it just me or is Farage losing his formerly steady touch?