It's indeed interesting to see politicians having this kind of tweets.
Although he's wrong and LN won't stop the miners mine, hence will not reduce any consumption, his semi-conclusion is right: we need more LN nodes, we need  better adoption of LN (especially by the centralized exchanges!)
And the fact he already knows that LN exists is "a big deal" 
Ah, and innovation to make more efficient miners will only increase the hash rate, since mining will be even more profitable. It won't make mining greener.

Yeah so he gets the LN reduces consumption part wrong but good to see a US Rep supporting Bitcoin, actually at least having heard of LN, and supporting Bitcoin mining getting even further onto renewables. Hopefully a side consequence of institutional money coming into Bitcoin will be that these institutions will put some money to renewable mining initiatives. If the powers that be in the US (corporate, local, state, fed) were smart they'd be jumping on bitcoin mining, shifting the mining power away from the Chinese economy to the US economy, and building it all on renewables, with bitcoin subsidizing these renewables instead of needing tax payer subsidies like power generation (of all types) normally has.

Well, they will get some idea of how LN makes things change. If they are concerned with energy consumption, they must have to support the said innovation, not just by looking into the negative side of how Bitcoin leads to increase criminal activities.
It is a good thing that they had open their minds and hope these leaders won't stop pushing it until the time it finally gets approval. This will be the stepping stone that LN will get recognition and high value to the community.