Fast flickering LED kitchen light fixture
It's the electronic driver, no doubt of it.
I couldn't quite read the numbers on it.  But it's calling out a very exact current flow (I underlined in red).... and a general/wide working voltage range (underlined in blue).

If you can find a driver module that same size, you can swap 'em out.  Current is the critical factor; it must be exact.  If you find drivers that aren't quite in that voltage range, you can carefully scrape the insulation off the 2 wires where I point to in green, and measure the lamp's actual working voltage with a voltmeter (while it's lit normally).  Your driver needs to support that voltage and 3-5 volts on either side.
My usual source for drivers is Mouser.com, and they have a search engine to let you narrow by current and voltage.  However a quick look showed a quality Meanwell unit, but it wasn't that shape (form factor).  Alibaba/AliExpress.com is awash with driver circuits of that exact form factor, in the $1 to $3 range, and ePacket delivery from China is cheap.  The downside of course is you're getting cheap Cheese junk, and it won't last any longer than the last one.

Speaking of that... There are several Chinese dumpers who are absolutely flooding Amazon with junk.  The dumpers have certain patterns: Amazon Marketplace (&quot;Sold by XXX and Fulfilled by Amazon&quot; right under the &quot;Buy&quot; button), no UL Listing nor any other reliable testing lab (CE, ROHS, LVD and EMC are not a testing lab), the brand sounds weird and doesn't have a normal marketing/support/jobs website, the brand is fairly new, etc.
Their typical business model is they find super cheap stuff on Alibaba/AliExpress, have the manufacturer  put them in boxes labeled for Amazon fulfillment, ship them straight from China to the Amazon warehouse, create a listing with price just a little below quality units, then sell a few units to shills who then write the early fake reviews.  People get suckered in either because the product description is competent or they don't realize Amazon Marketplace is a flea market of junk.

At first I thought this was a dumper I call &quot;Ikea Guy&quot; (because he has hundreds of fake brands that sound like items in the Ikea catalog).  But now I'm not so sure, because I see non-Amazon sellers also selling them under that brand. They may just have a funny name and be fairly new.   Just be careful; products from those dumpers are the bottom of the barrel and simply will not last.  The 18 month experience is consistent with the dumped junk.
That's been my experience too.  I once bought a 10W LED security light for $10 from a dumper, and a $15 one from LEDWholesalers, who is an importer. Both Chinese of course but you could tell the latter was much better made.  The no-name one went out after a year. The other is still going after 6 years.