There don’t seem to be any unusual steps needed to produce this bug, just posting a youtube video will do it. Affects videos posted before today as well (assuming a recent update is the cause).
Everything else related to the video (actual link to original, video replay) is unaffected.
Update - this appears to only applies to the image generated before the actual video loads. Clicking ‘play’ and loading the video switches out the /devicesupport URL for the title of the Youtube video.
The devicesupport message is probably displayed due to deprecation of old API v2 (used by lazyYT while fetching title):
In March 2014, we announced that the v2 API would be retired in April 20, 2015, and would be shut down soon thereafter. To help you with your migration, we launched the migration guide in September. Now, we’d like to provide you with more details on the plan to retire v2.
YouTube Data API (v3) now requires Google Account and registering a new application to retrieve video info via v3 API
Also:
The YouTube Data API uses a quota to ensure that developers use the service as intended and do not create applications that unfairly reduce service quality or limit access for others. All API requests, including invalid requests, incur at least a one-point quota cost.