The amendment wording was this:
"and requires the Northern Ireland backstop to be replaced with alternative arrangements to avoid a hard border; supports leaving the European Union with a deal and would therefore support the Withdrawal Agreement subject to this change"
This particular numpty is upset that his own, fantasy interpretation of "alternative arrangements" wasn't the chosen strategy. With good reason, as they're hilariously inadequate.
So, no. There was no "instructing the government to pursue a specific line". The amendment wording was deliberately vague, as anything more precise wouldn't have passed.
In the future coffee table book bestseller, "1,001 times Theresa May acted in bad faith", this would be lucky to make the cut.