Google Translate says 'several' not 'few'
"I think now that Mercedes and Ferrari's (power unit) are nearly equal, after that it is Renault 3rd and I think that there is a Honda near there, but it is the fourth. I think that it is necessary to raise the output of several tens of kW in order to extract it. "
Let's for the sake of the argument say it's a few, that could make it around 30 to 40 kW down (or possibly more), which translates to around 40 to 50 bhp.
Not saying it's not possible, but the following do not support this:
1. Yamamoto also said that Honda is near Renault, however, I can't see how that could be the case if they were 50bhp down?
2. Earlier in the season, it was stated that Honda are give or take 10 bhp down on Renault. That would mean that Renault this year found between 70 and 80 bhp already?
3. Red Bull surely have the numbers at hand, and if they were really 50 bhp down, I doubt they would have swapped. Marko and Mateschitz have often said that they are extremely close.
4. 50bhp down on Renault would possibly mean 80 to 100 bhp down on Ferrari and Mercedes. Now unless Haas and Force India are parachutes, even with DRS, how the heck would Gasly overtake both in Canada?
5. It's been mentioned that spec2 would finally close the gap to Renault. We know that both Honda and Renault brought around 20bhp with their spec 2, Honda possibly a little bit more, so I have no idea how suddenly from closing the gap they went to a possible 50bhp deficit?
All of which make me think that the deficit he is talking about is not to Renault, but to Ferrari and Mercedes, whereas any deficit to Renault would run around 10kW max.
Excuse me for mentioning a lot of 'facts' without supporting with a links. Would take me quite longer as I would need to search for them, but if in doubt, I'll happily oblige when I have some time