This article from june 2019 confirms that I think:
Abiteboul said that he was not really taken aback that Red Bull elected to go the Honda route, having originally indicated last year that it did not want its supply deal to go on beyond 2018.
"Not surprised whatsoever, frankly," he said about Red Bull's choice.
"I think first we tend to forget this is a confirmation – it is more a status quo actually.
"Last year in Singapore we announced a comprehensive set of agreements with both the Red Bull group and McLaren.
"This was featuring a termination of Toro Rosso at the end of 2017 and termination of Red Bull at the end of 2018, even though Red Bull had requested to be a bit more vague about that topic.
"It is more that it went in a different direction when Red Bull requested to us an offer, as there was a bit of indecision about which way to go.
"For us it is more a confirmation of what was in the air, and which is also a strategic and commercial decision more than purely a technical or sporting decision from Red Bull."
But I don't read that as Red Bull being forced to Honda, as Abiteboul explains in the same article:
Abiteboul suggested that the added attraction of a works relationship with Honda, allied to potential financial benefit, was a clear motivation for Red Bull.
"Just like when we returned to the sport as a works team, it was important for Red Bull to renew and get back to a position of being a works team," explained Abiteboul.
"It could not be with Renault, it had to be with another entity and they found in Honda a perfect match.
"So I am sure it is a mix of factors and parameters. I am sure that there something related to performance, but it is very clear there is much more than this.
"And there are a number of things that we could not offer, like financial support, like access to core facilities, because our priority and focus is on the consolidation of the performance of Renault Sport F1."